Note: This is book four of eight of the Submarine Boys Series. 

THE SUBMARINE BOYS AND THE SPIES

Dodging the Sharks of the Deep

by

VICTOR G. DURHAM

1910

CONTENTS

CHAPTERS I. "Guess Day" at Spruce Beach II. Trouble in the Making Stage III. On the Edge of the Spider's Web IV. Kamanako Appears on the Scene V. Eph Learns Something New VI. The Little Russian has His Way VII. A Pointer Jolts the Submarine Captain VIII. Even Up for Mr. Kamanako IX. "Dog, Who is Your Master?" X. M. Lemaire Proves His Training XI. Jack's Friends Do Some Fast Guessing XII. In the Power of the Spies XIII. The Fellow Who Showed the White Flag XIV. A Remembrance From Shore XV. Captain Jack Becomes Suspicious XVI. The Government Takes a Hand XVII. Drummond's Little Surprise--For HimselfXVIII. "Remember What Happened to the 'Maine'!" XIX. A Joke on the Secret Service! XX. A Bright Look and a Deadly Warning XXI. A French Rat in the Corner XXII. Gallant Even to the FoeXXIII. "Good-Bye, My Captain!" XXIV. Conclusion

CHAPTER I

"GUESS DAY" AT SPRUCE BEACH

"Has anyone sighted them yet?"

"No. "

"What can be the matter?"

"You know, their specialty is going to the bottom. Possibly they've gonethere once too often. "

"Don't!" shuddered a young woman. "Try not to be gruesome always, George. "

The young man laughed as he turned aside. 

Everyone and his friend at Spruce Beach was asking similar questions. None of the answers were satisfactory, because nobody knew just whatreply to make. 

Everyone in the North who has the money and leisure to get away fromhome during a portion of the winter knows Spruce Beach. It is one ofnature's most beautiful spots on the eastern coast of Florida, and manhas made it one of the most expensive places in the world. 

In other words, Spruce Beach is a paradise to look at. The climate, inthe winter months, is mild and balmy. Health grows rapidly at thisfavored spot, and so fashion has seized upon it as her own. True, thereare yet a few cottages and boarding houses left where travelers ofmoderate means may find board. 

The whole air of Spruce Beach is one of holiday expectancy. The wintervisitors go there to enjoy themselves; they expect it and demand it. They are gratified. From the first of December to the middle of March, life at Spruce Beach makes you think of a great, jolly, unending picnic. The greatest cause for regret is that more people of ordinary meanscannot go there and reap some of the plentiful harvest of fun and frolic. 

The thousands of tourists, hotel guests and cottagers at Spruce Beachhad been promised that by the middle of December they would have atreat the like of which few of them had ever enjoyed before. ThePollard Submarine Boat Company, so named after David Pollard theinventor--the company of which Jacob Farnum, the shipbuilder, waspresident--had promised that by that date their newest, fastest and mostformidable submarine torpedo boat, the "Benson, " should arrive at SpruceBeach, there to begin a series of demonstrations and trials. 

Still more extraordinary, the captain of this marvelous new submarinecraft of war was known to be a boy of sixteen--Jack Benson, after whomthe new navy-destroyer had been named. 

Newspaper readers were beginning to be familiar with the name of CaptainJack Benson. Though so young he had, after a stern apprenticeship, actually succeeded in making himself a world-known expert in the handlingof submarine torpedo boats. 

Those lighter readers of newspapers, who scoffed at the very idea of asixteen-year-old boy handling a costly submarine boat, were sometimesreminded that the same thing happens at the United States Naval Academyat Annapolis, where the young midshipmen are given instruction and oftenare qualified as young experts along similar lines. 

More remarkable still, as faithful readers of newspapers knew, CaptainJack Benson had associated with him, on the new torpedo boat, two othersixteen-year-old boys, by name Hal Hastings and Eph Somers. It was alsorumored, and nearly as often believed, that these three sea-bred youngAmericans knew as much as anyone in the United States on the specialsubject of submarine boat handling. 

Be that all as it might, it was known to every man, woman and child atSpruce Beach that the "Benson" was due to arrive on this December dayand the whole picnicking population was out to watch the incoming fromthe sea of the strange craft. 

More than that, the United States gunboat, "Waverly, " had been for twodays at anchor in the little, somewhat rockbound harbor just north ofthe beach. It was to be the pleasant duty of the naval officercommanding the "Waverly" to extend official welcome to the "Benson" assoon as that craft pointed its cigar-shaped nose into the harbor. 

The first boat built by the submarine company had been named, after theinventor, the "Pollard. " The second had been named the "Farnum, " inhonor of the enterprising young shipbuilder who had financed this bigundertaking. And now Spruce Beach was awaiting the arrival of thecompany's third boat, the "Benson, " so-called in recognition of the hardand brilliant work done by the young skipper himself. 

That this was to be something of a social and gala occasion, even onboard the gunboat, was evident from the fact that on the naval vessel'sdecks there now promenaded some two score of ladies and their escortsfrom shore, and on the hurricane deck lounged musicians from hotelorchestras on shore, these men of music having been combined to form aband, in order to make the occasion more joyous. 

"Look at that shore, black with people!" cried a woman to one of thenaval officers on the deck of the "Waverly. "

"There must be at least ten thousand people in that crowd, " laughedLieutenant Featherstone. "I wonder whether they're more interested inthe boat, or its boy officers?"

"Are Captain Benson and his comrades really as clever as some of thenewspapers have made them out to be?" asked the woman doubtfully. 

"Judging by letters I've had from friends who are officers at the NavalAcademy, " replied Lieutenant Featherstone, "the young men must be verywell versed, indeed, in all the arts of their peculiar profession. "

A cheer went up from the principal throng over at the beach. Smoke hadbeen sighted off on the eastern horizon, and this must come from thelong expected craft. 

From boat to boat the news passed, and so it traveled to the deck ofthe "Waverly, " where the sailors received it with broad smiles. Theleader of the impromptu band raised his baton, rapping for attention. But Lieutenant Featherstone, below, caught the leader's eye in time andheld up his hand for a pause. 

"If you play, leader, " called the officer, in a low voice that carried, nevertheless, "don't imagine that your music is to welcome the 'Benson. 'Submarine boats don't travel under steam power. They can't. "

So, too, on shore, the understanding was quickly reached that the smokedid not indicate the whereabouts of the expected submarine. Half andhour later it was found that the smoke came from the tug of a fruittransporting company. 

Where, then, was the "Benson?"

It was not in the least like young Captain Jack Benson to be behind timewhen he had an appointment to get anywhere. Nor did that very youthfulcompanion expect to arrive late on this day of days. 

Some miles away from Spruce Beach the submarine boat, as shown by hersubmersion gauge, was running along at six miles an hour some fifty-twofeet under the surface of the ocean. 

Young Eph Somers, auburn-haired and ofttimes impulsive, now looked assober as a judge as he sat perched up in the conning tower, beyond which, at that depth, he could not see a thing. However, a shaded incandescentlight dropped its rays over the surface of the compass by the aid ofwhich Eph was steering with mathematical exactness. 

Out in the engine room stood Hal Hastings, closely watching everymovement of even as trusted and capable a man as Williamson, one of themachinists from the Farnum shipyards. 

At the cabin table sat Captain Jack Benson himself, his head bent lowas he scanned a chart. His right hand held a pair of nickeled dividers. Near his left lay a scale rule. A paper pad, half covered with figures, also lay within reach. 

On the opposite side of the table sat Jacob Farnum, owner of the Farnumshipyard and president of the Pollard Submarine Boat Company. BesideMr. Farnum sat David Pollard, the inventor. 

Readers of the preceding volumes in this series are familiar with allthese people, now decidedly famous in the submarine boat world. In thefirst volume, "_The Submarine Boys on Duty_, " was related how all thesepeople came together; how the boys, by sheer force of character "brokeinto" the submarine boating world. In that volume the building of thefirst of the company's boats, the "Pollard" was described, and all theexciting adventures that were connected with the event were fullynarrated. 

Our former readers will also remember all the wonderful adventures andthe rollicking fun set forth in the second volume, under the title of"_The Submarine Boys' Trial Trip_. " In this book, bristling withadventures, and made lighter, in spots, by accounts of humorous doings, was told how the boys gained fame as submarine experts. It was theirfine, loyal work that interested the United States government in buyingthat first boat, the "Pollard. "

The third volume in the series, entitled "_The Submarine Boys and theMiddies_" told how our young friends secured the prize detail atAnnapolis; where, for a brief time, the three submarine boys served asinstructors in submarine work to the young midshipmen at the NavalAcademy. Nor was this accomplished without serious, and even sensational, opposition from the representative of a rival submarine company. Hencethe boys went through some rousing adventures. Incidentally, theyfell against practical instruction in hazing at the Naval Academy. 

Adventures enough had befallen the submarine boys to last any man for alifetime. Yet, as fate decreed it, Captain Jack Benson and his staunchyoung comrades were now destined to adventures greater and furtherreaching than any of which they could have dreamed. In advance, thiswinter trip to Spruce Beach promised to be little more than a pleasantrelaxation for the youngsters. What it really turned out to be willsoon be made clear in the pages of this volume. 

"It seems a very risky plan that you're trying, Jack, " remarked JacobFarnum, at last. 

"Don't you want me to do it, sir?" asked the young skipper, looking upinstantly from his chart. 

"Why, er--"

But here David Pollard, the inventor of these boats broke in, eagerly:

"Of course we ought to do it, Farnum. Jack is wholly right. If we enterthe harbor at Spruce Beach in this fashion, and carry through our entireplan successfully, what on earth can there be left for opponents of ourclass of boats to say?"

"Not _if_ we succeed, of course, " smiled Farnum. "It's only the peskylittle 'if' that's bothering me at all. I don't want any of you tothink me a coward--"

"We know, very well, you're not, sir, " Captain Jack interposed, veryquietly. 

"But if we make any slip in our calculations, " continued Jacob Farnum, "the first bad thing about it is that we'll smash a fine boat which, otherwise, the United States Government is likely to want at a pricearound two hundred thousand dollars. That, however, is not the greatestrisk that I have in mind. On board this craft are five people withoutwhom it would be rather hopeless for anyone to go on building thePollard type of boat. Therefore, besides risking a valuable craft andour own rather inconsequential lives, we go further and put the UnitedStates Navy in danger of having only a couple of our boats. Now, thefact is, we want the Navy to have three or four dozen of our submarinecraft, for we ourselves believe implicitly in the great worth of thePollard boats. "

"That's just the point, sir, " cried Captain Jack Benson. 

"Eh? What is?" inquired Mr. Farnum, looking at his young skipper insome bewilderment. 

"Why, sir, " laughed Jack, "the point is that we believe our boats to beinfinitely ahead of anything owned in any other navy on earth. Webelieve it possible to do things, with boats like this one, that can beaccomplished with no other submarine craft in the world. Now, it's afact that, in all the navies, lest an accident happen to a submarine, that craft is obliged to travel about, always, in the company of a steamcraft of war, which is known as the parent ship. Yet we've come, straight from the shipyard at Dunhaven, many hundreds of miles, withoutany such escort. We've been running along under our own power, nightand day, without accident, stop or bother. Thus we've shown that thePollard boat can do things that no other submarine craft are evertrusted to try alone. And now, all that remains to show is that, at theend of a long voyage, we can approach a coast, unseen, even thoughthousands of people are probably looking for us, and that we can getinto a harbor without being detected; that, in fact, we could doanything we might have a mind to do to an enemy's ships that might bein that harbor. But now, sir, you propose that, lest we have accidents, it will be best to rise to the surface and enter the harbor at SpruceBeach as plainly and stupidly as though the 'Benson' were some merelumber schooner. "

"I see the thing just the way Jack Benson does, " murmured David Pollard, thrusting his hands down deep in his trousers pockets. 

"Oh, well, if I'm voted down, I'll give in, " laughed Jacob Farnum. "Iwonder, though, how Hal and Eph feel about this?"

"I don't have to ask them, " nodded Captain Jack, confidently. 

"Why not?"

"We settled it all, days ago, sir. "

"And they both agreed with you?"

"Down to the last jot, Mr. Farnum. They saw the beauty and the boldnessof the plan. "

Oh, well, go ahead, then, responded Mr. Farnum, rising and standing bythe cabin table. "Of course, the picturesque and romantic possibilitiesof the scheme are plain enough to me. We'll have the people at SpruceBeach agape with curiosity, then wild with enthusiasm. And, really, tobe sure, we have to arouse the enthusiasm of the American people overthis whole game. That's the surest way of forcing Congress to spendmore money on our boats. "

"Where are you going, Jake?" called the inventor, as his partner startedaft. 

"To the stateroom, to get a little nap, " replied the shipbuilder. "We'renot by any means due at Spruce Beach yet. "

"Jake Farnum is surely not a coward, " chuckled Mr. Pollard, as thestateroom door closed. "Nor is he over anxious about any detail in ourlittle game, or he couldn't go to sleep at this important time. I knowI couldn't get a wink of sleep if I turned in now. I've simply got tosit up, wide awake, until I see the finish of your bold stroke, JackBenson. "

Captain Jack laughed easily, then glanced at his watch to note the lapseof time since he had made his last calculation of their whereabouts. Itis one thing to be in the open air, navigating a vessel, but it is quiteanother affair to be fifty-odd feet below the surface, calculating allby the distance covered and the course steered. 

"Any deviation in the course, Eph?" Captain Jack called up into theconning tower. 

"Not by as much as a hair's breadth, " retorted young Somers, almostgruffly, for with him, to depart from a given course, was well nighequal to a capital crime. 

Jack touched a button in the side of the table. Obeying the summons, quiet Hal Hastings thrust his head out into the cabin. 

"Just the same speed, Hal?" the young captain asked. 

"Hasn't changed a single revolution per minute, " Hastings answered, briefly. 

With his watch on the table before him, and employing the scale rule anddividers, the young submarine skipper placed a new dot on the chart. 

"Something ought to be happening in three quarters of an hour, " Bensonremarked, with a chuckle, to Mr. Pollard. 

Less than half an hour later the young submarine skipper climbed up intothe conning tower beside Eph. 

"Same old straight course, eh, lad?" asked Jack quietly. 

"You know it, " retorted Eph. 

"Then we're where we ought to be, " responded Jack Benson, bendingforward. With his right hand on the speed control he shut off speed. 

"Now, just sit where you are, Eph, until I come up again, " advised theyoung commander. 

"Going to the surface?" demanded Somers, with interest. 

"Pretty close, " nodded Benson. 

Calling Mr. Pollard to his aid, Jack began to operate the machinery thatadmitted compressed air to the water tanks, expelling the watergradually from those same tanks. This was the means by which thesubmarine boat rose to the surface. All the time that he was doing this, Jack Benson kept his keen glance on the submersion gauge. At last hestopped. 

"How is it up there, Eph?" he called, pleasantly. 

"Why, of course there's a lot of good daylight filtering down through thewater now, " Somers admitted. 

Captain Jack went nimbly up the spiral stairway. Now, he had stillanother piece of apparatus to call into play. This affair is known tonaval men as the periscope. 

In effect, the periscope is a device which in the main is like a pipe;it can be pushed up through the top of the conning tower, through aspecial, water-proof cylinder, until the top of the periscope is a foot, or less, above the surface of the water. 

The top of this instrument is fitted with lenses and mirrors. Downthrough the shaft of the periscope are other mirrors, which pass alongany image reflected on the uppermost mirror of all. At the bottom ofthe periscope is the last mirror of the series, and, opening in uponthis, there is an eyepiece fitted with a lens. 

As Captain Jack Benson applied his right eye to the eyepiece he was ableto see anything above the surface of the water that lay in any directionthat the periscope was pointing. 

"Right opposite Spruce Beach, as the chart showed!" chuckled the youngcommander. Under the magnifying effect of the eyepiece lens Bensoncould see the beach, the flag-bedecked hotels, and the moving masses ofpeople on the shore. Yet, all this time, he was out at sea, more thana mile from the beach. The periscope itself, if seen from a boat aneighth of a mile away, would undoubtedly have been taken for a floatingbottle. 

"Let me have a peep, " demanded Somers. 

Eph looked briefly, then chuckled:

"Must be thousands of people over yonder, wondering what on earth hashappened to us!"

"Do you make out the gunboat, at anchor to the north of the hotelsection?" inquired Captain Jack. 

"Oh, yes. Say, they'll have an awakening on that gray craft, won'tthey?"

"If we don't make any slip in our calculations, " answered Benson, gravely. 

"Well, we're not going to make any slip, " asserted Eph Somers, stoutly. 

"Now, keep quiet, please, old fellow. I want to do a little calculatingbefore we take the last, desperate step. "

All this time the conning tower of the submarine was just a bit belowthe surface. Nothing but the slender shaft and the small head of theperiscope was above the wash of the lazy waves. 

Captain Jack soon had his calculation made. Then, with a quiet smile, he remarked:

"I guess you'd better get below, Eph, for your part. I'll take thewheel, now, and Mr. Pollard will attend to the submerging mechanisms. "

Eph laughed joyously as he darted below. He had a part assigned to himthat was bound to be enjoyable. 

"Mr. Pollard!" called down the young skipper, a few moments later. 

"Aye, Captain Jack!"

"Let her down slowly, please, until the gauge shows just fourteen feet. That's the greatest depth I dare try for the course we're going tofollow. "

"Aye, Captain Jack. Fourteen feet it shall be. "

For the benefit of some readers who may not understand, it is to bestated that the charts of harbors bear markings that show the exactdepth of water at every point in the harbor at low tide. Thus, thechart of the harbor just north of Spruce Beach had already told theyoung submarine skipper just how far below the surface he could travelwith safety to his craft. 

Further, he knew the draft of the "Waverly" to be eleven feet. So theyouthful commander could feel quite certain that he would be in no dangerof colliding, below the water-line, with Uncle Sam's gunboat. 

On the deck of the "Waverly" itself there was the same spirit ofexpectancy that there had been an hour earlier in the afternoon. 

Lieutenant Featherstone, executive officer of the gunboat, was not, however, impatient. In fact, he stood at the rail, aft, a pretty girlbeside him, and both were looking down musingly at the rippling waterbelow. 

"As I was saying, " drawled the lieutenant, "when--"

Just then he stopped, though he did not appear startled. 

Straight up out of the watery depths shot a Carroty-topped boy, his wetskin glistening in the sun. 

"Good gracious!" gasped the girl. "Where did that boy come from?"

"Say, sir, " called up Eph Somers, distinguishing the lieutenant in hisswift look, "where do you want the submarine boat to anchor?"

"What's that to you, young man?" called down Mr. Featherstone, bluntly. 

"Oh, just this much, sir, " retorted Eph, treading water, lazily; "Ibelong aboard the 'Benson, ' and I've been sent to inquire where you wantus to find our moorings. "

"You from the 'Benson'?" snorted the lieutenant, incredulously. "Thenwhere is your craft!"

"Coming, sir. "

"Coming?" jeered the lieutenant "So is Christmas!"

"The 'Benson' will be here first, sir, " retorted Eph, splashing, thenblowing a stream of water from his mouth. "The 'Benson, ' sir, is duehere in from twenty to thirty seconds!"

"What's that?" demanded the naval officer, sharply. Then a queer lookcame into his face as a suspicion of the truth flashed into his mind. He was about to speak when his feminine companion pointed, crying:

"What can that commotion mean out there?" There was a little flurry inthe waters, then a parting as something dull-colored loomed slowly up. 

Barely a hundred feet away from the port rail of the gunboat the newsubmarine boat, "Benson, " rose into sight. 

Eph Somers had left the craft, while still below surface, by means ofthe clever trick worked out by Jack Benson and his comrades, asdescribed in "_The Submarine Boys' Trial Trip_. "

Almost instantly the manhole cover was thrown open. Jack Benson, nattyas a tailor's model, in his newest uniform, stepped out on deck, wavinghis hand to the gunboat. 

"You'll have to consider that we got you, won't you, sir?" shouted theyoung submarine captain. 

Then, both on shore and on the decks of many craft, a realization ofwhat had happened dawned in the minds of thousands of people at aboutthe same instant. A great, combined cheer shot up--a cheer that wasa vocal cyclone!

CHAPTER II

TROUBLE IN THE MAKING STAGE

On the hurricane deck of the "Waverly" stood one man, mouth wide openand eyes a-stare, who couldn't seem to get the meaning of it all. Thatman was the leader of the combined band from the winter hotels. 

Turning, glancing upward, the lieutenant looked at the leader with aglance of cool wonder. 

"Play, man! Why don't you play? What are you there for?"

Then, all of a sudden, reddening, the band leader rapped his music standwith his baton, next gave the signal, and the band crashed forth intothe exultant strains of:

"See! The Conquering Hero comes!"

At the third measure the band was all but drowned out by renewedcheering, that came more uproariously than ever. 

Captain Jack Benson had surely chosen a dramatic manner of making hisappearance at Spruce Beach. Ten thousand tongues were set wagging allat once. When there came a lull, a man's voice on a tug not far fromthe gunboat could be heard, asserting loudly:

"Well, that's what submarines are for--to sneak in while you're wipinga speck of dust from your eye!"

That remark, coming just as the band ceased its strains, was plainlyaudible, and brought a laugh from everyone aboard the submarine, including Eph, who was just climbing, in his bathing suit, up to theplatform deck. 

Lieutenant Commander Kimball, hurrying from his cabin, had joinedLieutenant Featherstone at the rail, the pretty girl slipping away tojoin a group of civilians. 

"What do you think of us?" called Jacob Farnum, a broad grin of delighton his face. 

"You'll do, " admitted Kimball. 

"Do you consider yourself sunk?" demanded David Pollard, laughingly. 

"Theoretically, yes, " assented Lieutenant Commander Kimball. "I wonderif you could do it as well in war time?"

"Couldn't possibly do anything like it in war time, " called back CaptainJack Benson. "For, sir, you fly the Stars and, Stripes!"

That was a happy speech, delivered at just the right second. It set allwithin hearing to cheering again. And then the thousands beyond caughtit up. 

"I'll say this much, " shouted back Lieutenant Commander Kimball, as soonas he could make himself heard: "We'd rather have you with us, Mr. Benson, than against us. "

"You'll have your wish, sir, as long as I'm alive, " Jack answered, turning and lifting his hat in simple yet eloquent salute to the Flagwaving at the gunboat's stern. 

All this time Hal Hastings stood by the deck wheel, one hand occasionallystraying to the engine room signal buttons, as he kept the "Benson" justabout a hundred feet from the gunboat and nearly abeam. 

"Where shall I anchor, sir?" called Captain Jack, presently. 

"Better take it about four points off our port bow and at least fourhundred feet away, Mr. Benson, " called back the lieutenant commander. 

"Four points off port and four hundred feet it is, sir, " answered theyoung submarine skipper, saluting. Then he gave the order to Hal. 

"As soon as you're anchored, I'll send you over a boat to be at yourdisposal this afternoon, " called Lieutenant Commander Kimball. 

"We'll use the boat, sir, to pay you a visit, if you permit, " Jackshouted back. 

"By all means come aboard. Then we'll visit you. We're anxious tosee the works of such a wonderful little craft. "

Within ten minutes a man-o-war's cutter was alongside, rowed by sixalert-looking young sailors, while a coxswain held the tiller ropes. 

Messrs. Farnum and Pollard, Jack and Hal made up the visiting party, leaving Eph Somers aboard the submarine, with Williamson to help himat need. 

Cordial, indeed, was the reception of the submarine folks aboard thegunboat. There was a great amount of handshaking to be done. 

In the meantime, Eph Somers was having something in the way of troubleback on the platform deck of the "Benson. "

Two small boats, manned by harbor boatmen, and each carrying a fewpassengers, had put off from shore, and now ranged alongside. 

"How do you do, Captain?" shouted a young man at the bow of one of theboats. 

"Louder!" begged Eph. 

"How do you do, Captain?"

"Louder. I'm afraid the captain can't hear you yet, " grinned thecarroty-topped submarine boy. "He's over on the gunboat. "

"Then who are you?"

"Who? Me?" demanded Eph, innocently. "Oh, I'm only the Secretaryof the Navy. "

"All right, Mr. Secretary, " laughed the same young man. "We are comingaboard. "

"Aboard of what?" inquired Eph. 

"Why, you're submarine boat, of course, " came the answer. 

"Guess not!" responded Eph, briskly. 

"Why, yes; we're newspaper men, and it's business, not fun with us. "

The boat containing the speaker lay lightly alongside at this moment. In another moment the young man in the bow would have clambered upon deck, but Eph called down to him:

"Hold on! Stay where you are. My orders are to hit any fellow with aboathook who tries to come up here in the captain's absence. "

"But we've got to have a look at your boat, don't you see?" insistedthe newspaper man, though, as Eph carelessly picked up a boathook, thewould-be caller waited prudently in the bow of his boat. 

Young Somers was surely in a state of uncertainty. He had strict ordersto allow no one aboard unless he knew them to be United States navalofficers. On the other hand, the auburn-haired boy knew how necessaryit was for the submarine folks to keep on good terms with newspaperwriters if the American people were to be favorably impressed with theclaims of the Pollard boat. 

"Now, see here, " said Eph, balancing the boathook, "I'm sorry to standhere making a noise like a crank, but have you any idea at all whatorders mean on shipboard? And I'm under the strictest orders not tolet anyone aboard. "

"Get your orders changed, then, " proposed another newspaper man, cheerfully. 

"If you'll wait, I'll see if I can, " muttered Eph, hopefully. 

"Oh, we'll wait. "

Williamson's head had appeared in the manhole way. 

"Come out on deck, and don't let anyone on board unless we get ordersto that effect, " murmured Somers, passing the conning tower. Then, through a megaphone, the submarine boy hailed the gunboat, asking if itwould be possible for him to talk with Jack Benson. Benson soonafterward came forward on the "Waverly. " Eph explained the situation. Jack shouted back to allow the visitors on the platform deck, but notto let any of them into the conning tower, or below. 

So Eph turned to the two boatloads of visitors, explaining:

"Perhaps you men can get that all changed if you come out to-morrow, whenthe captain is here. But the best I can do to-day is to let you up hereon the platform deck. "

"Oh, well, " returned the first newspaper man to get up there beside theboy, "you can tell us, as well as anyone, about your trip down the coastand the way you slipped in here. "

"And also, " chimed in another, "you're the young man who came straightup through the water when she was beneath the surface?"

Eph admitted that he was. 

"That's the thing _I_ want to know about, " continued the second newspaperman. "I've heard before about that wonderful trick of leaving asubmerged submarine, and coming to the surface. How is the thing done?"

Eph regarded this questioner with wondering patience, before he replied:

"You want to know so little that I'm sorry I'm deaf in my front teeth anddumb in my right ear. "

"That's on you, Paisley!" chuckled one of the newspaper men. 

Then three or four began to ask questions at the same time, which causedyoung Somers to wait, then remarked blandly:

"Now, if you'll all kindly talk at once, I'll give you, in a few words, a straight account of the plain features of our trip down here, includingour run under water. But, if there's any question I don't answer foryou, you'll understand, I hope, that it's because I know it would bebad manners for me to tell you anything that only officers of the Navyhave a right to know. "

"All right, Commodore, " nodded one of the newspaper men, good-humoredly. "You're all right. Go ahead and spin your yarn in your own way. "

Thereupon, without telling anything that he had no right to tell, Ephmanaged none the less to give his hearers an entertaining account ofthe "Benson's" long trip down the coast without stop or help. 

"And, unless I'm in a big error, gentlemen, ours is the longest tripthat a submarine boat ever took by itself. "

"You're right there, too, " nodded one of the newspaper men, who made astudy of naval affairs and records. "And the way this craft came inthis afternoon beat anything, so far as I'm aware, that was ever donewith a submarine. "

"That's Captain Jack Benson's specialty, " replied Eph Somers, his eyestwinkling. 

"What's his specialty!"

"Doing things with a submarine boat that have never been done before. Captain Benson is the latest wonder in the submarine line. "

"He has a very steady admirer in you, hasn't he?" inquired one of thenewspaper men, laughingly. . 

"Yes; and the same is true of anyone else who knows him well, " declaredEph, warmly. "Jack Benson is about the best fellow on earth--and oneof the smartest, too, his comrades think. "

Thereupon one of the newspaper correspondents began tactfully to drawout young Somers about the history and past performances of the youngsubmarine captain. On this subject Somers talked as freely as theycould want. 

"It was Benson, too, who discovered the trick of leaving a submarineboat on the bottom, and coming to the top by himself, wasn't it?"slyly asked one of the visitors. 

"That was his discovery, " nodded Eph, promptly. 

"What's the principle of the trick?"

Eph's jaws snapped with a slight noise. He remained silent, for a fewmoments, before he replied:

"So far, that trick is known only to the Pollard people and a fewofficers of the Navy. The fewer that know, the better the chance ofkeeping it a secret. Don't you believe me?"

"That's one way of looking at it, perhaps, " nodded a reporter. "Butthere's another side to that, too, Somers. The United States now ownsome of your boats, and the money of the people paid for those boats. Now, don't you think the people of this country have a right to knowsome of the secrets for which they pay good money, and a lot of it?"

On hearing the question put that way Eph looked tremendously thoughtfulfor a few seconds. 

"Why, yes, undoubtedly, " admitted the carroty-topped submarine boy. "I never thought of it that way before. "

"Then--"

"See here, " interrupted Eph, "it was the Secretary of the Navy, whoon behalf of the people, bought our boats. "

"Yes--"

"He acted as the agent of the people, " Eph continued. 

"Well--"

"Therefore, " asserted Eph Somers, with a roguish twinkle in his eyes, "the Secretary of the Navy is the proper official for you to go to insearch of that information. And you may tell the Secretary--"

"Stop making fun of us, " interposed a newspaper man. 

"You may tell the Secretary, " finished Eph, "that I said I had noobjection to his giving you the information you want. "

The newspaper men after gazing briefly at the innocent-looking face ofthe carroty-topped one, began to grin. 

"Young Somers is all right, " declared one of the visitors. "He knowswhen to talk, and also when to hold his tongue. "

"I never was sized up so straight before, " grinned Eph, "since I wascaught stealing grapes behind the Methodist church. "

Before the newspaper men departed in their boats they had obtained someamusing and interesting points for a news "story. " Yet not one of themhad gained any inside information as to the closely guarded secrets ofthe submarine. Eph, from his very disposition and temperament, madeundoubtedly the best press agent the Pollard Company could have had. Hal Hastings, while wishing to be obliging, probably would have saidhis whole "say" in twenty or thirty words. Jack Benson would have sungthe praises of the Pollard boats readily enough. But it was Eph, aloneof the three, who could give to such an interview the humor and wit thatAmerican newspaper readers enjoy. 

One "reporter" in the party that was rowed back to the beach was notknown to his associates. Wherever several newspaper men are gatheredat a point on business it is generally easy for a stranger, not connectedwith the press, to push himself into the group. The stranger, in thisinstance, had given the name of Norton, claiming to be from an Omahapaper. 

Arrived at the beach, however, "Norton" did not hasten to the telegraphoffice. Instead, he hurried to the Hotel Clayton, the largest and mostexpensive of the hotels at Spruce Beach. 

Entering one of the elevators, Norton stepped off at the third floor. He stepped briskly down a corridor, stopping before a door and givingan unusual style of knock. 

"Come--in, " sounded a drawling voice, and Norton entered. 

From a seat by a table, in the center of the large room, rose a mansomewhat past middle age This man was tall, not very stout, with asallow face adorned by a mustache and goatee. The man's eyes werepiercing and black. His hair was also black, save where a slight graywas visible at the temples. 

As Norton entered, the man, who rose, threw a cigarette into the fireplace, then reached over, selected another cigarette and lighted it. The room was thick with the odor of some foreign tobacco. 

"Well, Norton?" challenged this stranger, in a low voice. 

"I've been aboard the new submarine, Monsieur Lemaire, " replied theyoung man. "I went with a party of newspaper writers, pretending to beone of their calling. "

"An excellent idea, Norton. And you saw the very boyish officers ofthe boat?"

"Only one of them. The other two were paying a call on board thegunboat. I saw Somers. "

"You gathered some idea of how to pump him for the information wanted, of course?"

"No; I didn't, " retorted Norton, scowling. "I learned, very soon, thatSomers is one whom we want to leave out of our count in gettinginformation?"

"Why so?"

"Well, M. Lemaire, if you meet that young fellow, and try to draw himout, you'll understand. He can talk longer, and tell less, than anyyoung fellow I've met. He seems to guess just what you want to know, and then he carefully tells you something else. "

"Ah, well, out of three young men, we shall find one who will tell us allwe need to know, " laughed M. Lemaire, gayly. "So it is only a questionof learning which of the three to make the first attempt upon. "

"If you want a suggestion--" began Norton. 

"By all means, my dear fellow. "

"Then turn your batteries of inquisitiveness loose upon Jack Benson, first of all. He may be easy game. As for the third, Hal Hastings, Ihear that he is a silent fellow, who says little, and generally waitsfive minutes, to think his answer over, before he gives it. "

"Benson it shall be, then, " nodded M. Lemaire. "I shall find it easyto meet him. And now, good-bye, Norton, until this evening. You willknow what to do then. "

After Norton had gone out, closing the door behind him, M. Lemairecarefully flecked the ash from his cigarette as he murmured to himself:

"Then it shall be Captain Benson whom we first attack! Nor do I believeI can do better than to enlist the services of Mademoiselle Sara. Ah, yes! Her eyes are fine--perfect. One looks into her eyes, and trustsher. Captain Jack Benson, you shall have the pleasure of meeting a mostcharming creature!"

CHAPTER III

ON THE EDGE OF THE SPIDER'S WEB

An hour after dinner the orchestra of the Hotel Clayton crashed out intothe first two-step. 

The big ballroom was already two thirds as well filled as it could bewith comfort. Potted green palms stood everywhere at the sides. Theorchestra in the gallery was nearly concealed behind a fringe of green. The air was sweetly odorous with the fragrance of southern blossoms. Scores of young women in all varieties of handsome evening dressenlivened the appearance of the scene. Their gems cast glitter andenchantment. There were men enough, too, for partners in the dance, the men behind expanses of white shirt-front and clad in the black ofevening dress. 

Just a few of the men, however, lent additional color to the scene. These were officers and midshipmen from the "Waverly, " who came attiredin the handsome blue, gold-braided dress uniforms of the service. 

Among the guests of the hotel who attended the dance were Jacob Farnumand his two young submarine experts; Jack Benson and Hal Hastings. Theshipbuilder had come ashore with his young friends, registering at theClayton and taking rooms there. 

"It's time for you youngsters to get ashore and have a little gaiety, "Farnum had declared. "If you don't mix with lively people once in awhile, you'll rust even while you keep the 'Benson's' machinery bright. "

Jack and Hal had agreed to this. Eph, however, had expressed himselfdecidedly as preferring to remain on board the submarine for the time. Williamson, too, had elected to remain on board, and so had DavidPollard, who rarely cared for anything in the social line. 

On the floor, even before the music struck up, was M. Lemaire. He wasin the usual black evening dress, though on his wide shirt frontglistened the jeweled decoration of some order conferred upon him by aEuropean sovereign. 

A handsome and distinguished figure did M. Lemaire present. He noddedaffably to many of the ladies in passing, and the interest with whichhis greetings were acknowledged proved that M. Lemaire was in a gatheringwhere he could boast many acquaintances. 

Almost at the first, M. Lemaire had succeeded in having Captain JackBenson pointed out to him. The tall, sallow man looked over thesubmarine boys eagerly, though covertly. He beheld them in handsomedress uniforms, very much like those worn by the naval officers, forJacob Farnum had insisted that his young submarine officers, whereverthey went must be appropriately attired. 

In the throng, as M. Lemaire passed, stood one handsomely dressed girl. Her face, which was interestingly beautiful, had a slightly foreign look. The jewels that she wore must have cost a fortune. The girl herself wasa finished product in the arts of good breeding and grace. 

As M. Lemaire approached her, this girl recognized him with a smile anda half-quizzical look. 

"Ah, good evening, Mademoiselle Nadiboff, " murmured M. Lemaire, as hebent low before the handsome young woman. "I am charmed. "

Then he murmured, in a low tone, swiftly:

"Yonder are, the two boys. Jack Benson is the one you will interest. You, Sara, know the arts of conversation well enough. Make him yourslave, until he is willing to tell all that we want to know. Invite himto drive with you in your auto car to-morrow. But, bah! You will knowhow to make him talk!"

All this was said swiftly, unheard by anyone else. Then M. Lemaire, having appeared hardly to pause, passed on. 

A minute later Mademoiselle Nadiboff was chatting laughingly withLieutenant Featherstone. 

"Who are those two young men over there?" questioned the young woman. "Are they of the Navy?"

"No, though related to us in interest, " replied the lieutenant. "Theyare the captain and chief engineer of the submarine that arrived thisafternoon. Youthful, aren't they?"

"Very, " agreed Mademoiselle Sara. "But I like their faces. You willpresent me, will you not, Lieutenant?"

"Gladly. "

So Jack and Hal found themselves bowing before the handsome youngforeigner. Mlle. Sara had the appearance of being, equally interestedin both of them, though she soon managed, with her social arts, indrawing somewhat aside with Jack Benson. 

And then the music crashed out. One of the young woman's feet began totap the floor, her eyes glistening. 

"Entrancing music, " she murmured. 

"If you are not engaged for this dance--" murmured Jack, hesitatingly. This beautiful creature seemed so superior to the usual run of the humankind that the submarine boy felt he was too presuming. 

"You are very kind, " replied the young woman, with a swift smile. "Ishall enjoy it greatly. "

Jack took one of her hands in his, resting his other hand lightly at herwaist. A moment later they glided over the polished floor. 

"Benson is doing famously, " laughed Lieutenant Featherstone, half-enviously. "But before I think of myself, Hastings, I must seek aninteresting partner for you, also. "

"Kind of you, " returned Hal, gratefully. "But I fear I must remain awall-flower, or a human palm to-night. I don't know how to dance. "

"You don't?" murmured Featherstone, in amazement. "Good heavens! Ithought even the bootblacks knew how to dance in these modern days!"

Jacob Farnum knew how to dance, but did not care for it this evening. He was much in love with his young wife, and, as she was not here, theballroom floor had no attractions for him. So he and Hal retired toseats at the side of the ballroom. 

"Jack is dancing with a famously pretty girl--the loveliest of manythat are here to-night, " smiled the shipbuilder. "I trust he won't havehis head turned. "

"Don't worry, sir, " Hal rejoined, briefly. 

The second dance, also, Jack Benson enjoyed with Mlle. Nadiboff. Theyoung woman herself arranged that gracefully. At the end of the seconddance Jack led his partner to a seat. Then she sent him for a glass ofwater. 

Her cobwebby lace handkerchief fell to the floor. M. Lemaire, passingat that instant, espied it, picked it up, and returned it to her withthe bow of a polished man of the world. 

"Flatter the young fellow! Make him dance attendance on you to the pointthat he forgets all else, " whispered the man. 

"Trust me for that, " murmured the girl. 

"I do. " And M. Lemaire was gone, swallowed up in the increasing throng. 

As Jack Benson brought the glass of water Mlle. Nadiboff sipped at itdaintily. Raising her eyes so that she could read the placard nowsuspended from the balcony rail, she announced:

"The next number is a waltz, Captain Benson. Truly, I am eager to knowhow you waltz. It is a sailor's measure. "

"Then perhaps you will favor me with a waltz, later in the evening, "returned Jack, courteously. "But if I had the impudence to ask youfor this waltz, and if you were generous enough to grant it to me, Iknow what would happen. "

"What, my friend?"

The word "friend" was gently spoken, but Jack Benson replied bluntly:

"Some of the men here would lynch me, later in the night, Mlle. Nadiboff. "

The young woman laughed musically, though, as Jack glanced away for aninstant, a frown flashed briefly over her face. 

"You will not disappoint me, I know, Captain, " she murmured, persuasively. "Besides, you are too brave to fear lynching for an actthat grants pleasure. "

This was so direct that Jack Benson could not well escape. Nor, truthto tell, did he want to. He found Mlle. Nadiboff's bright, gentle smilemost alluring. So, when the music for the waltz sounded the submarinecaptain led her forth on to the floor. 

At the finish, after Jack had led his partner to a seat, LieutenantFeatherstone joined them. One or two others approached, and Bensonslipped away, though just before he did so the young woman's eyes methis with a flash of invitation to seek her again later. 

"You've been extremely, attentive, but I, imagine some of the other menare combining to thrash you, Jack, " smiled Farnum, when Benson returnedto his friends. 

"Mlle. Nadiboff is a very delightful young woman, " Jack answered, heartily. "I'm sorry you don't dance, Hal. "

"If I were very sorry, I'd learn, " rejoined Hastings, simply. 

During the waltz and the number that followed Jack remained with hisfriends, looking on. 

Then Lieutenant Featherstone, feeling that the Navy must look to theenjoyment of these strangers, came over to them. 

"How many of you dance?" inquired the lieutenant. 

"Two of us, " answered Hal. "I don't. "

"Mr. Farnum, I must introduce you to an agreeable partner, " urged theNavy officer. "Who shall it be? I know most of the ladies here. "

"Don't think me a bear, Mr. Featherstone, but I don't believe I'lldance to-night, though I thank you tremendously, " replied theshipbuilder. 

"Then, Benson, you must uphold the honor of your party, " laughed thelieutenant, linking his arm in Jack's and drawing him forward. 

Captain Benson's next dance was with a California girl; after that heled out a jolly young woman from New York. As he left the latterpartner, Mlle. Nadiboff, on the arm of a gentleman, passed close enoughto murmur:

"Captain, you are neglecting me--and I have saved the next, a waltz, for you. "

Not being engaged for that waltz, Jack could hardly do, otherwise thanclaim it. Indeed, he greatly enjoyed dancing with this gracious, handsome young woman. Yet, soon after he had taken Mlle. Nadiboffto her seat, and another partner appeared to claim her favor, Bensonslipped away. 

"Go after Captain Benson, I beg of you, and bring him back here fora moment, " requested the young woman of her new partner. That gentlemanobeyed, even if with a poor grace. Jack returned, bowing, while thegentleman walked away a few feet. 

"Captain, you are a stranger here at Spruce Beach?" murmured Mlle. Nadiboff, directing the full gaze of her luminous eyes at Jack's. 

"Yes, truly. "

"I go motoring at eleven in the morning. I shall expect you here, atthat hour, to drive with me. "

Jack looked as regretful as he felt. 

"I'm very, very sorry, Mademoiselle" he replied. "But I am here onduty, and--"

"Duty?" she interrupted, with a light laugh. "And pray what is duty, Captain, but a something with which to flavor our pleasures in life?"

"With me, Mlle. Nadiboff, " Jack Benson replied, earnestly, "duty iseverything, pleasure included. "

"I am not accustomed to having my commands disregarded, " exclaimed theyoung woman, though in a low tone, while her eyes flashed some of herdispleasure. 

"You are giving me pain, Mademoiselle, " Jack responded, gravely. "Perhaps, at another time--"

"Enough sir!" the young woman interposed. "And now I behold my nextpartner glancing this way appealingly. I shall speak with you the nexttime we meet, Captain. "

Jack bowed, withdrawing. Making his way around the ballroom, he droppedinto a seat beside Mr. Farnum. 

Even before Mlle. Nadiboff's partner could rejoin her, M. Lemaireappeared around a palm at Mlle. Nadiboff's back as naturally as thoughhe had not been playing the eavesdropper. 

"Have a care, Sara, " he whispered, mockingly, "or you will fail inmaking a fool of that young fellow!"

Half way through the next dance Jack and his friends remained in theirseats. Then Hal, stifling a yawn behind his hand, remarked:

"I've a notion that I shall be asleep in a few minutes. Late hours, except on duty, don't jibe with our line of work. "

"They don't, " admitted Captain Jack, rising. 

"Good, boys!" nodded Mr. Farnum, approvingly, as he also rose. "Themore rest you have the keener your wits will be for your work. "

So they left the ballroom, observed by but few. 

Five minutes later Mlle. Nadiboff sat surrounded by three men, withwhom she was chatting gayly. M. Lemaire approached her. She greetedhim so pointedly that the other three men soon fell away. 

"I can hardly congratulate you, Sara, " hissed M. Lemaire, speaking inFrench. 

"You think I have not made young Benson attentive enough to my whims?"the young woman asked, plaintively. 

"Attentive?" sneered M. Lemaire. "Do you know where he is now?"

"No, " admitted Mlle. Nadiboff. 

"He has gone away upstairs with his friends, that they may all beprepared for an early and full day's work. "

"You are jesting with me, " protested Mlle. Nadiboff, indignantly. 

"Take my arm, then, if you will, " requested M. Lemaire. "We will strollabout, and we shall see if your eyes are keen enough to discover youryoung submarine captain. "

The young woman defiantly accepted the challenge. By the time thatthey had strolled around the ballroom scarlet spots glowed in her cheeks. In either eye a tear of anger glistened behind the lash. 

"Are you satisfied?" murmured M. Lemaire, in a low voice. 

"I fear that I shall have to teach the young cub a lesson or two in theart of showing devotion to a woman's wishes, " Mlle. Nadiboff answered, tremulously. 

"Shall we walk in the grounds?"

"I beg you to take me out into the air, " replied the young woman. 

"Yes, it will be better, " whispered her companion, cruelly. "Your faceis aflame. You will attract too much attention here, and too muchcuriosity. The American naval officers have sharp eyes--sometimes!"

Procuring his companion's wrap at the coatroom, and throwing a lighttopcoat about himself, M. Lemaire led the way to a distant settee fromwhich they could look out over the star lit waters beyond the beach. The man had an especial reason for choosing this seat. From that placethey could quickly catch sight of anyone who came near enough tooverhear. 

"Sara, " began M. Lemaire, less brutally than his companion had expectedhim to speak, "for once I fear that you are going to fail utterly. "

"Then you do, not know me, " she replied, with spirit. "I shall win!I shall have Captain Jack Benson carrying my fan and craving my smile. And that shall be quickly, too!"

"If you do not succeed, Sara, " retorted the man, "then sterner measureswill have to be tried. This youthful Benson may even have to lose hislife in the attempt that must be made, at all hazards, to wrest from hima set of drawings of the boat he commands, and a description of all herworking parts, and all the secrets of managing the boat!"

"If he could hear you, he would be charmed with the outlook, " mutteredthe young woman, shrugging her shoulders. 

"Sara, do you comprehend the situation altogether? The Pollard type ofsubmarine boat is now the most formidable and dangerous in theworld--and only the United States Government can buy boats from themakers! Any country in the world that goes to war with the UnitedStates must be beaten unless that country knows how to provide itselfwith submarine boats equal to those of the Pollard make. You may besure that, at this moment, Spruce Beach is overrun with spiesrepresenting every great government in the world. The first country tobuy, steal, coax or drag out the Pollard secrets wins! You know themaster we serve, Sara, among the governments. We must be the spieswho win--even though all the Pollard crew have to be destroyed!"

CHAPTER IV

KAMANAKO APPEARS ON THE SCENE

Had Jack Benson or Hal Hastings heard that strange talk, perhaps neitherof them would have slept as soundly that night. 

As it was, both submarine boys slept more soundly and sweetly than anyother human being in that great hotel, unless, possibly, it were JacobFarnum. 

At daylight all three were astir. 

Wrapped in bathrobes that concealed their bathing suits the three madetheir way down to the beach. There, for ten minutes, they enjoyedthemselves in the surf. 

"Seems mighty queer to be bathing in salt water in December, doesn'tit?" demanded Hal, gleefully, as, with both hands, he launched a columnof salt water that caught Jack neatly in the face. 

"Anyway, I believe it's just what the family medical man ordered, "chuckled Mr. Farnum, as he stepped shoreward, then ran briskly up anddown the beach before he went in again for a final plunge. 

Over to the bath house, where an attendant had carried their clothing, the three now hastened. After a brisk rub-down and dressing, thesethree from the "Benson" presented themselves in the hotel dining room, where, at this very early hour, they were privileged to breakfast allby themselves. 

"The way my appetite feels, " laughed Jack, enjoyably, "I pity the guestswho have to follow us at table. "

"There won't be any breakfast left. They can have lunch, " declared HalHastings, gravely. 

Hardly had the food been placed before them when Mr. Farnum glanced up, to find at his elbow a bowing, smiling little Japanese. 

"Honorable sir, may I address you while you eat?" inquired the littlebrown man. 

"Why not?" asked Farnum, good-humoredly. "Take a chair, won't you, Mr. --"

"Kamanako is my name, honorable sir, " replied the Japanese, with threemore bows. 

"Take a seat, won't you, Mr. Kamanako?" Mr. Farnum invited him again. 

"It is much better, honorable sir, that I stand. "

"Why?"

"Because I am servant. "

"Not here, surely, " replied the shipbuilder. "All the waiters hereare negroes. "

"Not all in kitchen, honorable sir, " responded the Japanese, with an airof great deference. "Some in kitchen are Japanese. "

"Are you employed in the kitchen, Mr. Kamanako?" asked the shipbuilder. 

"Until to-day, honorable sir. "

"Meaning you have left the employ of the hotel?"

"Yes, honorable sir. "

"Then you're going away from here?"

"I hope to follow the sea, honorable sir. I am a sailor. All myancestors before me were sailors. We love the salt water. "

"There is something, then, that I can do for you, isn't there?" guessedthe shipbuilder. 

"If you will be so good, honorable sir. I seek to become steward aboardyour boat. "

"Oh, " replied M. Farnum, understanding, at last. "You will have tospeak to Captain Benson about that. "

He indicated Jack by a nod, so the little Japanese turned to Bensonwith another bow. 

Now, as it happened, a steward was just what Captain Benson wanted. Such duties, formerly, had fallen upon Eph Somers. But now cooking andserving meals did not exactly jibe with Eph's present position aboardthe "Benson" Eph was really first officer or mate. 

"Yes, we want a steward, " Jack admitted. "There's just one drawback, though, Kamanako. We can carry very few people aboard, so that everyonewho does ship with us has to count. In other words, our steward mustalso cook the meals in the galley. "

"I think that will be all right, honorable Captain, " replied theJapanese, thoughtfully. "How many have you on board?"

"Six, " answered the young submarine commander. 

Kamanako thoughtfully counted that number on his fingers. 

"It is not too many, " replied the Japanese. "What do you pay, honorableCaptain?"

"Forty dollars, and found. "

"I will accept, honorable Captain. "

"Are you sure that you can cook well enough for hungry sailors?"

"I am satisfied that I can cook for anyone, honorable Captain, " rejoinedthe little brown man, rather proudly. 

"That sounds well enough, " smiled Jack. "Have you had your breakfast, Kamanako?"

"Oh, yes, honorable Captain. "

"Then, if you'll wait for us, we'll take you aboard. We shall be goingin a half an hour, or sooner. "

"Would it not be as well, honorable Captain, if I go out before you?"asked Kamanako, respectfully. 

"No, " smiled, Benson. "Our first officer, Mr. Somers, does not takekindly to strangers who are not introduced. "

"Then, if I may suggest--if honorable Captain will write note forme--then I might go out sooner. "

"If you want to go aboard, Kamanako, we'll take you out when we go, "Jack replied. He was annoyed, though he could not have told why, bythe little brown man's insistence. 

Smiling and bowing again, Kamanako left the dining room. He was waiting, though, when the others came out. As all three carried dress suit casesthe Japanese quietly took those belonging to Mr. Farnum and CaptainBenson. 

"Most sorry I have not three hands, honorable officer, " Kamanako assuredHal Hastings. 

There were always plenty of shore boats at Spruce Beach. Just now, onaccount of the visit of the submarine, there appeared to be more of thesmall craft than usual. So the submarine party had no difficulty infinding transportation at once. Looking out into the harbor they beheldthe "Benson, " surrounded by more than a score of rowboats containingsight-seers. Eph Somers, backed by Williamson, stood on the platformdeck, doggedly driving away people who wanted to come on board. YetEph kept wholly good-natured about it, for he could quite appreciate thecuriosity of the sight-seers. 

As this last boat from shore made its way, through the concourse ofboats Jack heard a sudden, joyous hail in a woman's voice. 

"Oh, here he is--my gallant young captain. "

"Mlle. Nadiboff!" ejaculated Jack, under his breath. 

Jacob Farnum turned his head away for an instant, but the young captainheard the unmistakable sound of a chuckle from the shipbuilder. 

Kamanako turned his mild eyes inquiringly in the direction of thehandsome young woman, as though he wondered who she might be. 

"Good morning, Mademoiselle, " was Jack's greeting, as he courteouslylifted his uniform cap. Hal and Mr. Farnum also uncovered. Then theboat ran alongside, and all four clambered on the deck. 

In another instant. Mlle. Nadiboff's boat was also alongside. 

"You are going to be kind, my Captain, and invite me aboard?" asked theyoung woman. Eph Somers, who was never intentionally rude to a woman, found himself staring with all his eyes, whereat he colored hotly. 

"I shall be very glad to invite you as far as I am permitted to invitevisitors, " Benson replied. Then, turning briefly to Eph, he muttered:

"The Japanese is to be cook and steward. Take him below, and showhim the galley and the supplies. "

Then Benson turned to reach down his hand to Mlle. Sara Nadiboff, whotrustingly extended her hand to him. She slipped. Jack was obligedto throw his left arm lightly around her waist in order to draw herin safety to the platform deck. Mr. Farnum, after seeing her safelyaboard, vanished inside the conning tower, going below to smile quietlyto himself. 

"As gallant as ever, my Captain!" murmured the handsome young womanspy, gazing almost tenderly into Jack's face. "What a very strangecraft! And now, conduct me below, please. I am much interested inseeing how you all live aboard such a little and odd vessel of war. "

"I am utterly sorry, Mademoiselle, " Jack Benson replied. "But my ordersare that no visitors except naval officers, or those brought aboard bynaval officers, may see the interior of the boat. "

"Yet that Japanese has just gone below!" remonstrated Mlle. Nadiboff. 

"The Japanese, " replied the young captain, "is our cook and steward, andbelongs below. "

A light glowed swiftly in Mlle. Nadiboff's eyes, but disappeared almostinstantly. 

The handsome young woman opened her mouth as though to speak, thencompressed her lips tightly. 

CHAPTER V

EPH LEARNS SOMETHING NEW

"You are not as gallant as you were last night, " murmured Mlle. Sara, ina low tone. 

"Last night I was ashore, on social pleasures bent, " replied Jack. "To-day, I am on duty, and duty must go ahead of everything else. "

"And I am hungry, " continued the young woman, pathetically. "In myeagerness to see that boat that you command, my Captain, I came awayfrom the shore before going through the ceremony of breakfast. Do youmean to say, Captain Benson, that you cannot conduct me to your cabin, there to have that--your Japanese--serve me with at least a sandwich?"

"Mademoiselle, " cried Jack, apologetically, "you can't have the faintestidea how sorry I am that my instructions are what they are I feel wickedas I look at your distress, but it is simply wholly impossible for me toask you below. I can have food served to you on deck, however. "

"What? Eat here before the eyes of all Spruce Beach? And have it madeperfectly plain to every onlooker that I am not welcome here?" cried thewoman spy, reproachfully. 

"Oh, but, indeed, you are welcome here, " protested Jack. "As welcome asI am permitted to make anyone. My orders, you know--I am a slave tothose orders. "

"Yet there is some one aboard, " urged Mlle. Nadiboff, in her mostpleading voice, while there was an almost tearful look in her prettyeyes, "some one who can change the orders. Your Mr. Farnum, I take it. Go to him, won't you, and plead with him for me? Go!"

One of her little, gloved hands rested on his arm, pushing gently. 

But Jack Benson, though she made him feel inwardly at odds with himself, thought more of his duty than of anything else. 

"I am very sorry--awfully sorry, Mlle. Nadiboff. But won't youunderstand that what you ask is wholly impossible?"

"Good-bye, then!" she said, resentfully, though gently, half turningfrom him. 

"You'll shake hands, won't you?" asked Jack, holding out his own righthand. 

"Perhaps, after I have talked with you on shore--when we meet again, "she replied, a bit distantly. Then she turned to Williamson as her boatcame in close alongside. "Your hand, please. I am afraid I may slip. "

Williamson helped that most attractive young woman down over the side, lifting his cap after he had seen her safe aboard the rowboat. Asthe harbor craft veered off, Captain Jack Benson lifted his cap withall courtesy. Mlle. Sara Nadiboff bowed to him rather coldly. 

"I suppose, " sighed Jack, to himself, as he turned away, "a woman can'tbegin to understand why we must be so secret aboard a submarine craftthat all the naval men in the world would like to know about. If sheonly could understand!"

Had Benson been able to guess just how well the handsome young spy didunderstand, and how much she had hoped to learn through appealing to hisinterest in her, he would have been furious at the thought of his owngreat simplicity. 

"Your charming partner of last night was rather disappointed, " observedHal Hastings. 

"Yes; she must feel that I have used her mighty shabbily, " Jackresponded. "I am afraid she won't forgive me. "

"Oh, well, after a few days you'll never see her again, " murmured Hal. "Just because a girl is pleasant--and pretty--one can't forget all theorders that he's working under. "

Captain Jack Benson talked to himself in about the same strain, yet hecouldn't wholly get over the notion that he had been--thoughhelplessly--rude to a woman. 

"You won't need me on deck any more, will you, sir?" asked Williamson, saluting. 

"No; I shall be on deck, " Jack replied, returning the salute. "Verylikely Mr. Hastings will be here with me, for that matter. "

Soon after the machinist had gone below Eph Somers returned to the deck. 

"I've been posting that Kimono, " Eph explained. 

"Kamanako, " laughed Captain Jack. 

"Oh, it's all the same to me, " sighed Eph. "To my untrained ear allJapanese names sound alike. "

"Whatever you do, " warned Jack, "don't, hurt the poor fellow's feelingsby calling him Kimono. "

"Why not?"

"Well, the Japanese are a proud and sensitive race. 

"Suppose they are?"

"Do you know what 'Kimono' means, Eph?"

"Haven't even a guilty suspicion. "

"It's the Japanese name for a woman's dress. "

"Wow!" muttered Somers. "I shall surely have to, forget 'Kimono, ' then. What do you call his truly name?"

"Kamanako, " Jack responded, and spelled it. Eph wrote the name downon a slip of paper, saying:

"Thank you, Jack. I'll try to commit this name to memory. I don't wantto hurt the feelings of a sensitive little fellow. It would be a shameto have to punch him if he felt insulted and made a pass at me. "

"Punch him, eh?" laughed Jack in genuine enjoyment. "Eph! Eph! Don'tmake any false start like that!"

"What are you talking about?" questioned Somers. 

"Don't make the mistake, at any time, Of trying to punch that Japanese. "

"Trying to?" gasped Somers. "Say, if I made a swing at that lightcolored little chocolate drop, do you think I'd make a false pass andhit my own nose?"

"You might be lucky if nothing worse happened, " grinned Jack. "Eph, did you never hear of the Japanese jiu-jitsu?"

"What's that?" demanded young Somers. "Slang name for something elsein the Jap wardrobe?"

"No; it's the Jap way of fighting, " Captain Benson explained. "And youwant to remember, Eph, that's it's a mighty sudden system, too. It hitslike lightning. When the smoke clears away you see a little Japanesebowing over you, and apologizing for having rudely tipped you over. "

"And little Cabbage-Jacko could do that?" Eph grinned, incredulously. "Say, it's wrong to tell me such funny things when I have a cracked lip. "

"All right, " sighed Jack. "But at least you've been warned. "

Truth to tell, the young submarine commander wasn't much worried aboutEph's deliberately provoking any fistic encounter with a fellow muchsmaller than himself. In the first place, the carroty-haired boy wasn'tquarrelsome, unless actually driven into a fight. At all times Somerswas too manly to take out wrath on anyone merely up to his own shoulderheight. 

Nearly an hour later Jack Benson stepped through into the conning tower;then moved down the spiral staircase. 

His rubber-soled deck shoes made no noise. Thus it happened that theyoung submarine commander came upon the new steward most un expectedly, and without being seen by the little, brown man. 

"Kamanako--you scoundrel!" shouted the young captain, beside himselfwith sudden wrath. 

For the Japanese, wholly absorbed in his present task, had deftlyremoved the gauge from the midships submergence apparatus, and was nowdissecting the gauge itself, eyeing the parts with the knowing look ofan expert. 

At sound of the captain's voice Kamanako wheeled calmly about, holdingup the gauge. The smile on the face of the Japanese was childlike andbland. 

"This very queer thing, " he murmured. "What for you useit--thermometer. "

"No, " retorted Jack Benson, frigidly, eyeing the detected one. "It's abarometer, and it shows which way a meddler blows in!"

"I don't understand, " remarked the Japanese, looking perplexed. 

"Then I'll help you to understand. First of all, put that gauge downon the table!"

Kamanako did so, then made a little bow. 

"Now, " continued Jack Benson, "take cap and go up on deck. "

"What shall I do there, Captain?" asked Kamanako, politely. 

"Well, you'll stand there until I see if you've done anything else onboard. If you haven't, you can then take a boat to the shore--and staythere. "

"What this mean, honorable Captain?" demanded Kamanako, a look ofoffense beginning to creep into his little, brown face. 

"Well, if you must have it, " returned Benson, coldly, "it means thatI've found you spying into our mechanisms here. Now, a spy is acreature no one cares to have about--least of all on a warship. "

"You call me spy--call me ugly name like that?" cried Kamanako, showinghis teeth. 

"Get your hat and go up on deck. Do you hear me?" insisted Captain Jack. 

"I hear you, but I please myself about when I do it, " retorted theJapanese, drawing himself up to his full though not very imposing height. 

"Then you'll go without waiting for your hat, " retorted Benson, hispatience rapidly oozing now. He started toward the Japanese, justas Eph, hearing the sound of talking, looked in and down the staircase. 

"Gunpowder and smoke!" ejaculated the carroty-topped boy. "It's littlechocolate drop!"

"Are you going up on deck quietly and in an orderly way?" demandedBenson, a resolute glitter in his clear, blue eyes. 

"I please myself, " retorted Kamanako, defiantly. 

At that Jack Benson promptly forgot the warning he had given Eph, andsprang at the inquisitive steward. 

"You'll go--" began Benson. 

He was in error, though. It was he himself who "went. " As he reachedout with his right hand to seize Kamanako something happened. Exactlywhat it was the young submarine captain never quite knew. But he foundhimself sprawling under the seat at the opposite side of the cabin. 

"Hi, yi! Wow!" exploded Eph, darting down the stairs. "Save some ofthat for me!"

It was ready and waiting. 

The carroty-topped boy crouched low, resting his hands on his knees, after the manner of a football player awaiting an assault. 

Kamanako slid in close. Ere Eph could seize him the Japanese lethimself fall lightly on one side. One of his feet hooked itself behindEph's advanced left ankle, the other foot pressing against the knee ofthe same leg. Eph's ankle was yanked forward, his knee pressed back, and Somers went toppling as a tree in the forest does. 

Kamanako was so quickly on his feet again to suggest that he had fallenand risen in the same movement. There was a quiet, yet dangerous, smileon the face of the Japanese. 

The door of the engine room opened swiftly though noiselessly. Williamson, the machinist, took in the whole scene instantly. Hardly afull step forward he took when his fist landed between the shoulders ofKamanako, sending that young Japanese through the air, to land sprawling. 

As Kamanako leaped to his feet he found himself blinking at the muzzleof a revolver that the machinist held in his right hand. 

CHAPTER VI

THE LITTLE RUSSIAN HAS HER WAY

"Don't get troublesome, " advised the machinist, softly. "I've never shota Jap, but I've always wanted to. "

There was a flicker of a grin in Williamson's face that found areflection in Kamanako's own features. 

By this time Jack Benson was on his feet, a bit ruffled though with allhis wits about him. At the same time Hal Hastings peered down from thetop of the staircase. 

"You've had all the fun so far, Kamanako, " Jack admitted. "But nowyou've got to get off this boat mighty quick. Do you choose to gowithout any more fuss?"

"I go when I get ready, " retorted the Japanese, sullenly. 

"What's the matter, Jack?" asked Hal, slowly. 

"I've caught a dirty spy at work overhauling our mechanisms, " repliedthe young submarine boat commander. 

With something of a snarl Kamanako turned as though to spring at Bensonagain. The sight of Williamson, immovable as a piece of marble, yetholding that revolver suggestively, cooled the Japanese ardor. 

"How will it do, Captain, " queried Hal, "if I pass the word to thegunboat and, have a file of marines come over to take charge of thisspy?"

"First rate, " clicked Benson, and Kamanako looked decidedly uneasy. Hehad his own reasons why he didn't care to be placed under arrest byUnited States troops. 

Eph, striking on his head, had been knocked senseless. He was toostrong, however, too full of vitality, to remain knocked out for long. Now, he half opened his eyes, as he murmured:

"How beautifully the birds are singing today! And there's mother, letting down the bars so the cows can go to the milking shed!"

Jack laughed, in spite of himself. Then he turned to the Japanese. 

"Kamanako, do you want to go quietly, or remain to see what the Navyofficers do with you?"

"I go now, " replied the Japanese, with a shrug of his shoulders. 

Turning, he started up the step, while Hal Hastings, regaining the deckbefore him, hailed one of the harbor boats. 

Jack darted to where Eph was trying to sit up, and raised him to oneof the cabin seats. 

"What do you think, now, of jiu-jitsu?" asked the young captain. 

"I don't know, " confessed Somers, sheepishly. "I didn't see any of it. "

At this moment a stateroom door opened and Jacob Farnum thrust hishead out. 

"Anything happening?" inquired the ship builder. 

"No, sir, " Jack answered. "It's all over. "

Mr. Farnum came out, to ask further particulars. Williamson, as soon ashe had seen the Japanese disappear up aloft, dropped his revolver backinto his pocket, closing the engine room door. 

Eph, however, had his own private idea of vengeance to execute. Up thestairs he went, holding hard to the spiral rail, for he was still a bitdizzy. Kamanako, having dropped into the stern of a shore boat, lookedunconcerned as he was pulled away. 

"Yah!" grunted Eph, shaking his fist. "You kimono! Kimono! Kimono!"

"What does that mean when it's translated?" inquired Hal, lookinginterested. 

"That's a Japanese insult, " grinned young Somers. 

"Do you think Kamanako understands it?" queried Hastings. 

"If he doesn't then what good does it do him to be Japanese?" Ephdemanded. 

Jacob Farnum listened with great interest to what his young captain hadto tell him. David Pollard, being still asleep, had no notion, as yet, of what had happened. 

"I reckon, " muttered the shipbuilder, "It won't be any use to have anyJapanese aboard here as steward, or as anything else. "

"I shan't hire any more of them, " Benson replied. "I shall alwayssuspect a spy, after this, when I see any Japanese aboard any kind of awar craft, or serving at any military post. "

"I'm sorry I missed seeing Eph do the flying somersault act, though, "laughed Mr. Farnum. 

"I missed it as much as you did, " admitted Jack Benson. "At the momentmy face was buried in the carpet. "

When the two ascended to the platform deck Captain Jack asked, soberly:

"Well, Eph, what is your present opinion about the ability of a Japaneseto look after himself?"

"Don't rub it in, " muttered Somers, with another sheepish grin. 

"Oh, that's all right, " retorted Jack. "I came in for pretty nearly asmuch as you did. I may meet Kamanako again, however. If I do, I'll payhim back. "

"What?" gasped young Somers. "Jack Benson, I thought you knew enough tobe sure when you've had plenty!"

"I'll pay that little fellow back, just the same, if I ever get ahalf-way chance, " insisted Benson. 

"Please yourself, " muttered Eph, grimly. "As for me, I'm not lookingfor any damages. I've had plenty of 'em already. "

Not much later the submarine people were favored by a visit from someof the officers of the gunboat. 

Plans were discussed for making some displays of the submarine's strongpoints on another day. When the officers had gone, Mr. Farnum turned tothe boys to propose:

"You've never seen any of the country around Spruce Beach. Neither haveI. What do you say if we go ashore? I'll charter an auto, and we canhave quite a trip before it's luncheon time. Then we'll come back andeat at the hotel. "

Right under the shadow of the gunboat, Williamson could be relied uponas being sufficient guard. But David Pollard declined to go ashore, onthe plea that he had some letters to write, which left a guard of twoon board. 

It was eleven o'clock, just to the minute, as the automobile charteredby Mr. Farnum came around the corner of the hotel veranda. At that sameinstant another and handsomer car came rolling into sight. The door ofthe ladies' parlor opened, and Mlle. Sara Nadiboff, arrayed withunusually pleasing effect, came out. 

As she caught sight of Jack she started, then came eagerly over to him, holding out her hand. 

"Here comes my car, " she murmured. "And I see, my Captain, that you havechanged your mind. You will drive with me this morning. "

"I'm sorry that I can't, " Benson replied, and he meant it. "But I amengaged to go with Mr. Farnum and our party. "

"You prefer to avoid me?" cried Mlle. Nadiboff, reproachfully, raisingher eyes swiftly to his. 

"Now, please don't say that, " begged Benson. "I wish you couldunderstand, Mademoiselle, how far from the truth it is. "

"Say but the word, and Mr. Farnum will pardon you, " coaxed the charmingyoung Woman. 

"I couldn't even think of that, " replied Benson. "It is business to gowith one's employer. "

"Business?" repeated Mlle. Nadiboff, with an accent half of disdain. "Surely, you are not sufficiently a petty shop-keeper or serf to thinkalways of that word, 'business!'"

"I fear I am, " Jack nodded. 

"Bah! Then you will never be a success with the ladies, " tauntedMlle. Nadiboff, though her eyes were laughing, challenging. 

"Of course, I'm only a green country boy, " Jack replied, with admirablecoolness, and without any tone of offence. "So my highest ambition isto be a success in the submarine business. "

The young woman had tact enough to perceive that she had not quitescored by her contempt for business. She was about to change subjectadroitly, when Mr. Farnum called, laughingly:

"Are you coming with us, captain? Or, have you found pleasanter companyfor a drive?"

Jack's hand started toward his uniform cap. He was about to excusehimself, when the young woman answered for him:

"He was just assuring me, Mr. Farnum, that he would gladly go with me, but that you had the right of prior engagement. "

"Oh, I'll release, him, " volunteered Mr. Farnum, his eyes twinkling. 

"Now, my Captain, you can no longer find excuse, unless you truly preferother company to mine. "

Though Jack was interested in the vivacious manner of Mlle. Nadiboff, hehad not yet lost his head under any of her flatteries. He was secretlyirritated against Mr. Farnum for letting him off so easily. So Jackswiftly determined upon his own plan of evening matters. 

"The way the affair has turned out, Mademoiselle, I shall be delightedto go in your cars. Yet I am going to ask one every great favor. "

"A thousand, if you wish!" cried the young woman spy, graciously. 

"Will you permit me to invite my chum, Mr. Hastings?"

"Assuredly, " she replied, with a very pretty pout, "if you feel that youwill find my company, alone, too dull. "

"It isn't that, " Jack replied, with ready gallantry. "I am anxious tohave Hastings share my rare good fortune. "

Then raising his voice he called:

"Hal, Mlle. Nadiboff desires me to invite you to come, too. "

Young Hastings was quick-witted enough to understand that this was allbut a command from his chum. So he hastily left Mr. Farnum, steppingover to join the other party. Mlle. Nadiboff's little booted right foottapped the flooring of the veranda impatiently, but that was the onlysign of displeasure she gave. Her eyes were as laughing and asgracious as ever. She extended her hand to Hal, who bowed low over itin knightly style--a trick he had caught from his observation of navalofficers. 

Then, as though to punish Jack, Mlle. Nadiboff asked:

"You will hand me into the car, Mr. Hastings?"

Hal did so, taking the seat beside her in the tonneau. Jack Benson, suppressing a twinkle that struggled to his eyes, closed the tonneaudoor, then stepped in on the front seat beside the chauffeur. 

Despite her own cleverness, the young woman gave a slight gasp ofastonishment over this swift arrangement. 

"Decidedly, my young captain is not wholly, a fool, " she told herself. "When I seek to snub him, he puts it past my power. However, it maybe that this young engineer will be better suited to my purpose. I willstudy him. "

"Toot! toot!" The Farnum auto, getting away first, went past them, sounding its whistle while Mr. Farnum and Eph lifted their hats. 

"Our gallant friend, the captain, must feel out of conceit with me, "laughed Mlle. Nadiboff to Hal. "He prefers the chauffeur's company tomine. So we must console ourselves. "

Though he had not been able to hear any of the conversation, M. Lemaire, looking out from behind the lace curtains of a parlor window, had seenwhat had happened. 

"Sara is doing better this morning, " he muttered to himself. "Thoughwhy should she take two of the young men with her? Ah, I see that shehas the engineer at her side, while young Benson rides on the frontseat. Clever little woman! She is going to make the young captainjealous! Well enough does she know how to do that!"

Not quite so well pleased was the young woman herself, as the driveproceeded. Though she did all in her power to charm Hal, and though shedid succeed in interesting him, she could not draw the boy out into muchconversation. Hal usually had little to say. Though he answered Mlle. Nadiboff courteously from time to time, he did not utter many words. Indeed, he appeared to be thinking of something far remote from thepresent scene. 

"Are you bored, Mr. Hastings? Does the sound of my voice annoy you?"asked Mlle. Nadiboff, as the auto flew over the quiet country roadsinland from Spruce Beach. 

"Good gracious, no!" replied Hal. 

"Then why do you say so little?"

"Because you say it so much better, Mademoiselle. "

"But flattery will never take the place of interested conversation. "

"Engineers don't talk much, " protested Hal. 

"So they think a great deal. Of what were you thinking?"

"Oh?" murmured Hal. "Oh, I was thinking of my engine, I guess. "

Mlle. Nadiboff bit her lips in secret rage. If she had felt that shewas doing poorly with Captain Jack Benson, evidently she was now seatedbeside an absent-minded sphinx. 

"What place is that over there?" inquired Hal, coming out of a brownstudy as he felt some reproach in the stiffening attitude of hiscompanion. 

Hal's eye had been caught by what looked like the ruins of an old castle. Such sights are at least rare in the United States. 

"That ruin, do you mean?" asked Mlle. Nadiboff. "Oh, it is a quaint bitof a castle, only some three hundred years old, though long past inruins. I believe it was erected as a stronghold by some wealthy man, in the old days when the pirates from Havana now and then swept alongthe coast on their raids. Would you like to see the place, Mr. Hastings?"

"Very much indeed, " Hal admitted, "if you have the time. "

"The time?" Mlle. Nadiboff's laughter rippled out merrily. "Why, I haveall the time in the world, Mr. Hastings. I live only to enjoy myself. "

"That must be rather a dull existence, then, " thought Hal, while hispretty companion leaned forward to give the order to the chauffeur, whoturned up a road leading to the ruined castle of the old piratical days. 

Jack had heard the conversation, and so knew, without asking, for whatthey were now heading. 

As they drew closer they discovered other automobiles near the oldcastle. 

"The place has several visitors to-day?" hinted Hal. 

"Oh, yes; it is one of the show spots of this section, " replied Mlle. Nadiboff. "It does well enough to look about there for a few minutes. But a ruin like that suggests death and decay, and I--I love life. "

"Still, that castle is now a part of history, " suggested Hal, "andhistory, it seems to me, should always be interesting. "

"This stupid young engineer!" fumed Mlle. Nadiboff, to herself. "Hewould drive me wild, if I saw much of him. I think even my slow littlecaptain will prove more romantic. "

Though neither of the submarine boys could yet suspect it, they were soonto stumble into much more than relics of the past. 

They were destined to find themselves exposed to one of the greatestsurprises of their already eventful lives. 

"Here we are, " cried Mlle. Nadiboff, as the auto stopped near the northend of the castle. "May you discover something to interest you!"

The submarine boys certainly did!

CHAPTER VII

A POINTER "JOLTS" THE SUBMARINE CAPTAIN

There was not much left of the old castle, save the walls, and some badlycrumbled ruins of inner buildings. 

"The Florida climate doesn't seem to agree with castles, " suggested Jack. "I have, an idea that, in Europe, a castle only three hundred years oldwould last much longer and keep much better. "

"In Europe?" repeated Mlle. Nadiboff. "Oh, yes; much better. But then, perhaps in Europe there would be a feeling of veneration for the oldthat would lead the people to take much better care of their castles. It would be so in my country, I know. "

"May I ask what is your country, Mademoiselle?" asked Jack, looking upand into her face. 

"Guess, Mr. Yankee!"

"Why, I would guess that you are a Russian. "

"You are worthy of the name of Yankee, then. Yes; I am a Russian. "

Another party of sight-seers passed them at that moment, and one man washeard to remark:

"At the south end of the castle is a stairway leading down to anunderground dungeon. Legend tells us that some forty Spanish pirateswere once confined there, for a month, before permission was receivedfrom the governor to hang the Spaniards. "

"Did you hear that?" murmured Jack, interestedly. "A real, old dungeon, with an interesting history. "

"Such a history merely afflicts me with a shudder, " replied Mlle. Nadiboff, shrugging her shoulders. 

"By Jove, I believe I'd like to have just a glimpse of that old dungeon, Mademoiselle, if I am not tiring you or wasting your time. "

"You will have to go alone, then, " replied the young woman. "I willwait, my Captain. "

"I will remain with Mlle. Nadiboff, " volunteered Hal. 

So Jack Benson, after raising his cap, stepped off rapidly toward thesouthern end of the old ruin. 

With much difficulty he found the entrance to the stairway leading below. At the head of the stairs two youngish men were standing. The face ofone of them looked familiar. 

"How do you do, Captain?" nodded that one. "You don't recall me, Iguess. I saw you, yesterday, only for a moment at the rail of thegunboat. My name is Hennessy, one of the newspaper men who visitedyour wonderful craft yesterday. "

"I am glad to meet you again, " Jack replied, "and sorry that we couldn'tshow you more. "

"This is my friend, Mr. Graham, " continued the newspaper man. "Grahamis the Washington correspondent for my paper, so of course he has heardof your boats before. "

"If you had been aboard, " smiled Jack, "you might have seen something inthe way of a little news happening. "

"What was that?"

"Why, we found a new Japanese steward, whom we had engaged, absorbed inhis study of some of our mechanisms. So we had to induce him to quitour service and go back to shore again. "

"A spy, eh?" smiled Graham. "There are many of them about. Whereverthere is anything connected with our national defense the spies ofEurope are sure to flock, until they have learned all they want to know. And I suspect that they rarely fail, in the end. You were fortunateto catch your Japanese at his tricks at so early a stage in the game. "

"I wish all these spies could be herded together and hanged!" mutteredCaptain Jack, in honest indignation. 

"Do you?" asked Graham, looking at the boy, with a queer smile. 

"Can you doubt it?" challenged Jack. 

Graham was silent for a few moments, puffing at his cigar. Then, speaking very slowly, he went on:

"Captain Benson, I wonder if you would be much offended if I offered yousome information that might prove of much value to you?"

"What makes you think, sir, I'm such a fool as that?" asked Jack, gazingat the Washington correspondent in great astonishment. 

"One sometimes has to use a good deal of caution, even in offeringwell-intended information, " replied the Washington correspondent, "Benson, I've been stationed at the national capital for eight years, now. I meet all kinds of people, and I see a good many others whom Idon't get to know, and don't want to know, and yet I become familiarwith their histories. "

"I don't doubt that, sir, " Jack assented. "The life of a Washingtoncorrespondent must be full of interesting things and experiences. "

"Washington itself is full of foreign spies, " pursued Graham, studyingthe ash on the end of his cigar. "After a newspaper man has been inWashington a while he begins to have people pointed out to him who areeither known or believed to be in the employ of foreign governments forthe purpose of getting information that our national authorities wouldmuch rather conceal. "

"That must be true, " agreed Benson. "And I suppose there are some veryclever men engaged in that peculiar line of business. "

"Some of the smartest of them are not men, but women, " continued Mr. Graham. "Men, perhaps, direct them, but the women spies, when they areyoung and good-looking, can usually coax a lot of information. "

"Oho! I'd like to get a look, some time, at one of these clever womenspies, " declared Jack, much interested. 

"That's just what I'm coming to, " pursued the Washington correspondent. "I hope you won't be offended, Benson, but I understand you havealready paid some attention to one of the brightest women in this line. "

"Mlle. Nadiboff?" cried Jack, guessing instantly what the other soughtto convey. 

"Yes, " nodded Graham. "Though I believe, when I first saw her, eightyears ago, she was using some other name than Nadiboff. "

"Eight years ago, " smiled Jack, "she must have been about thirteen yearsold. Do they employ, spies at such a tender age?"

"Eight years ago, " retorted Graham, "this young woman was, I should say, about twenty-one years old. I am aware that she looks hardly olderto-day. When I saw you with her ten minutes ago it was the first hintI had that she was in Florida. "

"So she's a spy?" muttered Jack Benson, speaking more to himself. "ThenI can understand why she seemed so anxious to interest me. I was notwrong about that. "

"No, " laughed Graham. "Beyond a doubt the young woman is very anxiousto please you, and to keep your interest. You happen to command a typeof submarine torpedo boat in which all the world is at present muchinterested. By the way, I wonder if Mlle. Nadiboff, as you call her, works under the directions of the same chief? He was a man--"

Here the Washington correspondent gave a description that caused JackBenson to exclaim:

"Why, that's M. Lemaire, to a dot!"

"I guess there's no doubt about it, then, " laughed Mr. Graham. "You'vefallen into the hands of a pair of the boldest, wickedest and cleverestof foreign spies. "

"I thank you heartily for informing me about them, " breathed Jack Benson, his eyes gleaming as he thought of the pair. "But there's one thingthat puzzles me. Mlle. Nadiboff is a Russian, and M. Lemaire must be aFrenchman. Then which country owns that precious pair?"

"Spies rarely have any country, " smiled the washington correspondent. "They work for whichever government will pay them best. Today they willsell out their employers of yesterday. "

"They're a noble lot, then, " grunted Jack, disgustedly. 

Mr. Hennessy proposed that they go down to have a look at the dungeonunderground. While they were examining that damp, slimy old cell, theconversation continued. 

"Has either of that pair seen you, Mr. Graham?" asked Jack. 

"I don't believe it. I'm not stopping at the Hotel Clayton. "

"Then neither of them will suspect that I've been posted, " mutteredBenson, with a short laugh. 

"Why do you say that?"

"Because I rather think, " smiled the young submarine captain, "that Imay attempt to pay that pair back in their own coin--somehow. By theway, do either of them know you well when they see you?"

"They might remember me as a newspaper writer, " replied Graham. "SoI'll keep out of the way. "

"It won't be necessary for me to keep out of the way, " added Hennessy. "I don't know either Mlle. Nadiboff or her companion; and, besides, I'mhere openly as a reporter interested in the submarine craft. "

By this time the three had returned to the upper air. 

"I'll vanish, now, " proposed Mr. Graham. "But you, Hennessy, if CaptainBenson doesn't mind, might as well go along with him. You may get agood look at the Nadiboff woman. You, too, may think her very young. She has a knack of keeping so. Yet she's at least twenty-eight orthirty. Good-bye, for the present!"

Graham turned, losing himself from their sight amid the ruins. Hennessywalked with Jack back to where Hal and the woman awaited them. 

Jack's mind was rapidly revolving plans for teaching some one a lessonthat would not be forgotten. 

CHAPTER VIII

EVEN UP FOR MR. KAMANAKO

"This is Mr. Hennessy, one of the newspaper men who visited our boatyesterday afternoon, " said Jack, on rejoining his companions. "Mr. Hennessy has been returning good for evil. While I am unable to tellhim any of the things he wants most to know about our boat, he, on theother hand, has been telling me much of interest about these ruins. "

"There are a lot of legends about this old wreck of a castle, " laughedHennessy. "Most of them are too silly to consider for a moment. Oneof the old stories has to do with a secret passage. Some of the guideshereabouts show what they solemnly explain was one of the outlets ofthe secret passage in bygone days. Do you care to devote five minutesto looking at the ridiculous thing?"

Mlle. Nadiboff smilingly accepted the suggestion, so Hal and Jack alsoagreed. The reporter led the way across a field, pausing at last beforea fringe of weeds and low bushes. 

"Now, just step through this wild hedge, " Hennessy proposed, smilingly, "and you'll see how little it takes to start a yarn. Look out, though, that you don't fall down. "

As they stepped through the fringe cautiously the members of the partyfound themselves peering down the shaft of what appeared to be a veryordinary well. It was circular, in shape, and had been laid, on theinside, with a masonry of stones. 

"There is water at the bottom, isn't there?" inquired the woman Spy. 

"Yes, " replied Hennessy. "It was never anything more than a well. Yet, day before yesterday, one of the local guides brought me here andinsisted on telling me all about its having been an outlet of a famoussecret passage from the castle. I had some fishing tackle in mypocket, so I rigged up a line and weight, and let it down. I satisfiedmyself that there were about four feet of greenish, slimy water atthe bottom of a well. I wish you could have seen the guide's face!"

"Here come some visitors, now, " nudged Hal. 

Two men and four women, led by a guide, approached the place. 

"This shaft looks dark and mysterious enough, " began the guide, reelingoff a well learned lesson, "to be as full of historic interest andmystery as it really is. This shaft is what is left of one of theoutlets of the famous secret passage to and from the castle. "

While the new visitors crowded about, asking questions and offeringremarks, the party that Hennessy was guiding stepped into the background, secretly enjoying the guide's buncombe. 

"If people would only stop to use their good sense a bit, " whisperedHennessy, "they'd know, at once, that the shaft is only a long disusedwell. "

"Great Scott!" whispered Jack. "Here come Mr. Farnum and Eph with aguide. Let's see if they will be buncoed. "

Guide number two came up, with the shipbuilder and Somers in tow. Greetings were exchanged. Then the last arrived pair stepped forwardin the guide's wake. Farnum listened with an amused smile. 

"Oh, pshaw!" grunted Eph. "Is this the best you can show us? This isnothing but an old well, with ten feet of malaria at the bottom. Showus, for a change, something that we can believe. "

Hal began to laugh quietly. Then all hands stepped forward for anotherlook down the shaft. As they stepped outside again Benson happened toturn just in time to see a familiar figure coming along a path near by. 

It was Kamanako, better dressed than he had been earlier in the morning, and carrying a bulging dress suitcase. 

"Hullo!" muttered Jack Benson, in a tone loud enough to carry to theears of the newcomer. "There's that infernal Jap spy--that scoundrellythief of other men's secrets!"

Kamanako halted as abruptly as though he had been challenged by a sentry. As he saw the young captain a dark, red flush crept into the cheeks ofthe little, brown man. 

"You talk much, " sneered the Japanese his anger rising. 

"I say what I think about spies and fellows who would steal other men'ssecrets, " retorted the young submarine captain. 

"You will hold tongue better, if you please, " snapped Kamanako. 

"I? Hold my tongue for any scamp like you?" taunted Jack Benson. 

The taunt had the effect for which Jack wished. Kamanako, lookingfurious, dropped his dress suit case and ran angrily forward. 

Just in time, as the Japanese bounded through the fringe of weeds, Captain Jack dodged adroitly to one side. 

So Kamanako plunged past him--and, the next instant, there came asmothered yell from the inside of the well shaft. 

"Oh, that was a shame!" came indignantly, from one of the women in theparty of strangers. 

But Jack, paying no heed to her, had stepped back to the edge of thewell shaft. Dimly, down at the bottom, he could make out Kamanako, standing in slimy water that reached nearly up to his arm-pits. 

"Is the water fine, eh?" Jack called down, laughingly. 

"I show you--some time!" came the answer, in smothered rage. 

"You showed me Japanese jiu-jitsu, " mocked Benson "so I had to dosomething to return your courtesy. What I have just shown you iscalled--American strategy!"

By now Kamanako had succeeded in pulling himself part way out of thewater, using his hands and feet on projecting bits of the old masonry. 

"You'll get out, in time, for you're a patient fellow, " Jack calleddown, in a tantalizing kind of encouragement. "Don't forget the namethat I have just given you--American strategy. And, the next time afellow tries to make you mad, don't let him do it until you've lookedthe ground over. American strategy--yes, that's the name. "

Laughing, as he straightened up, Jack turned away from the shaft

"And aren't you going to throw him down a rope, or do something to helpthe poor fellow out?" demanded the same indignant woman. 

"Not in view of his line of offense, madame, " Benson replied, raisinghis cap. 

"Offense? What did he do?"

To the whole party Jack explained how Kamanako, that same morning, hadbeen caught spying upon the controlling mechanisms of the submarine boat. All the young skipper's hearers were satisfied, then, to leave theJapanese there to work his own way out, since no one feels any sorrowover the punishment of a spy. 

"Gunpowder and doughnuts! But you did get square, " chuckled Eph, as thesubmarine party turned back to the automobiles. 

"So that Japanese was a spy, you said?" murmured Mlle. Nadiboff, in alow tone, as they walked along. 

"Yes, beyond a doubt, " Jack assured her. 

"It must seem strange to be a spy, " murmured the young woman. "It mustgive one a strange feeling. "

"Yes, and a mighty mean feeling, " agreed Jack, coolly. 

As he spoke he raised his eyes carelessly to her face. He did not makethe glance so significant as to betray his real thoughts. 

Mlle. Nadiboff did not flinch nor change color under that brief scrutiny. Instead, she appeared to be almost lost in thought as she walked along. 

Suddenly she clutched at the young captain's arm. 

"I wonder if you would do something very great, to please me?" shemurmured, questioningly. 

"I'd certainly like to have you try me, " responded Jack Benson, in anequally low tone. He spoke the truth, too, for he believed that thischarming but dangerous companion was scheming some sudden move in herplans as, a spy. He wanted to find out what that move would be. Aboveall, if it were possible, he wanted to get knowledge of which foreigncountry she represented. 

"Won't you contrive to drive alone with me in my car, when we reachit?" she whispered, coaxingly. 

"And leave your chauffeur behind, also?" asked Jack, smiling. 

"That will not be necessary. I do not mind him. But I have much thatI wish to say to you, my Captain. As for your friend--pardon me, but heis dull, and--"

"Quiet, I think you mean, Mademoiselle, " interposed Jack. "Hal'sworst enemy, if he had one, would hardly call him dull. "

"Anyway, my Captain, " murmured the young woman, "he does not interest me, and I do want a few words with you. "

"This charming young spy, " muttered Benson quickly, to himself, "isbeginning to feel that I'm not enough interested to be coaxed away frommy duty by flatteries. I take it she means to show her real hand, andtry to play it in earnest. If that's the case, I want to know what sheis going to say. "

Aloud he replied:

"It will be easy enough to send my friend away with the others, Mademoiselle. When we reach the automobile all I shall have to do willbe to look straight at him. "

"Ah! You have a code of signals--you two?" Mlle. Nadiboff laughed, delightedly. 

"A code?" repeated Jack. "No; we have never needed one. But my chum isan unusually bright and quick young man. "

CHAPTER IX

"DOG, WHO IS YOUR MASTER?"

Seeing Jack and the young Russian woman so interested in their talk, theothers had gradually strolled away from them. 

Hennessy had already succeeded in securing an invitation to return toSpruce Beach in Mr. Farnum's hired auto. 

Hal Hastings presently turned, as though to step over to Mlle. Nadiboff'scar, but he caught a swift look from Jack, and turned back. Hal had notyet heard of the grave suspicion against the young woman, and could notguess what this move of his chum's meant. Hastings, however, was swiftto take the hint. 

"You have not overstated your friend's intelligence, " murmured the youngRussian gleefully. "At a short look from you he retreats. "

"Oh, Hal and I always understand each other, " smiled Jack. 

"That is very interesting. And yet I do not like Mr. Hastings as Ilike you, " replied the young woman. 

She looked at him with a friendly, little flash in her eyes. Had Jackbeen a few years older, and not warned, he might have been snared bythis experienced flirt. As it was, he did not take the trouble toanswer her last little speech. 

Just before they stepped into the car Mlle. Nadiboff uttered a few quickwords, in some foreign tongue, to her man at the steering wheel. Theauto sped away. Jack noted only, at first, that they were now goingfurther from Spruce Beach. The road down which they drove, however, was a beautiful one, and the submarine boy did not much mind where theywent, provided he could find out how Mlle. Nadiboff meant to make theapproach against his loyalty to the submarine company. 

"Do you know, my Captain, that you are hardly a flattering escort?"began Mlle. Nadiboff, after they had whirled along for a mile or more. 

"Why not?" Jack inquired, bluntly. 

"Have you noticed how I seem to please most men?"

"I saw that several were very anxious dance with you last evening, andthat, whenever you were seated, men flocked about your chair. "

"Why do you suppose they did that?" challenged Mlle. Nadiboff. 

"Because you are a very handsome woman, and the men admired you, " Bensonanswered, plainly. 

"Ah! Then you think I am handsome?"

"I haven't a doubt of it, " Jack answered. 

"Do you admire me?"

The challenge came plain and direct. Mlle. Nadiboff now gazedsearchingly into the submarine boy's eyes. 

"I--I think you a very handsome woman to look at, " Captain Jackadmitted, readily. 

"Is that all you have to say?"

"I--I am afraid I do not understand you, Mademoiselle. "

"You have no desire to be especially gallant to me? It would cause youno jealousy if you, saw that I preferred the company of other men?"

Jack Benson returned her glance, almost in, bewilderment for a moment. Then he leaned back, trying to stifle the impulse to laugh, but he didnot wholly succeed. 

"You are amused?" cried the young Russian, half angry. 

"Amused--yes, at the idea of my falling in love, if that was what youmeant to suggest, " replied Jack, again speaking very candidly. 

"And why should that amuse you, my Captain?"

"Why, do you know how old I am, Mlle. Nadiboff? Or rather, how young?I am only sixteen. At my age, if I formed any notion of being in love, it would be sensible to have me spanked and put on a short diet for afew days. "

He laughed merrily, now, and Mlle. Nadiboff turned away her head toconceal the tears of vexation that started to her eyes. 

"Bah!" she thought to herself. "I have been wasting time--at Lemaire'sorders. The only way to induce this boy to betray his trust will beby offering him presents of marbles, tops, kites--bah! _Bah!_"

Mlle. Nadiboff settled back in her seat, looking straight ahead, herattitude as frigid as could be. For some moments she did not attemptto speak. When she did open her lips she said, icily:

"I find that I have been wasting my time. "

"Wasting your time, Mademoiselle?" echoed Jack Benson, coolly, for hewas much more fully alive to the situation, thanks to Mr Graham, thanshe had any chance to know. "May I ask what you have been trying todo?"

The question made the young woman bite her lip. Mlle. Nadiboff had beena spy quite as long as Mr. Graham had stated. As she looked back overthe years she was able to recall man after man whom she had flatteredand lured by the witchery of her eyes. Secret after secret she hadcoaxed from men entrusted with guarding such mysteries. The rewards ofthe work had kept M. Lemaire and herself both bountifully supplied withmoney by the foreign governments that they had served as spies. Mostmen whom she had tried to win into her service the young Russian womanhad found easy enough victims. But now, here was a sixteen-year-oldboy laughing at her attempts at "cleverness. "

"I was wrong to think Jack Benson a fool, " she said to herself, angrily. "He is far more clever than the men I have met. I can do nothing withhim. I must turn him over to Lemaire--to see if that prince of spies, as he has often been called, can find the flaw in this submarine boy'sarmor. "

With that Mlle. Nadiboff leaned forward, murmuring a few words to thechauffeur, who nodded slightly. Then the young woman leaned back, turning a smiling, friendly but no longer coaxing face to Jack Benson. 

"If I have amused you, " she smiled, "I am glad. We will say that muchand forget the rest, eh, Captain Benson. "

"I am glad to agree to anything that will please you, " responded the boy, gravely. 

Mlle. Nadiboff shot a covert look at his face, then decided to saynothing. She began to have a suspicion that this sixteen-year-old boywas far more clever than she, despite all her years of strangeexperiences. 

A mile further along the automobile branched off the main road, runningdown a shaded lane at much reduced speed. 

"What is this--some short cut back to the beach?" asked Jack, tryingto conceal his astonishment. 

"Yes, " replied the young Russian, falsely. 

Soon the big car stopped. The chauffeur thrust a whistle between hislips, blowing a trilling blast. 

Jack Benson changed color somewhat. This sounded suspicious--a signalin the woods. It was doubly suspicious after the hints that Mr. Grahamhad given the young submarine captain. 

"Do not jump--do not be afraid, " laughed Mlle. Nadiboff, rathermaliciously. "Nothing in the way of danger threatens. "

Almost immediately the chug-chug of another auto was heard, just aheadup the narrow road. Then into sight glided a small runabout, which satM. Lemaire, all by himself. That Frenchman stopped his car, next wavingone hand gayly to those in the larger car. 

Then, lifting his hat most courteously to the young woman, M. Lemairestepped over to the other car. The Russian woman spoke in some tongue, the like of which Benson had never heard before. It was Arabic, alanguage that both of these spies understood perfectly. What shesaid was:

"The boy is yours. Do what you can with him. I admit that I havefailed. I have no hope of being able to do anything with him. "

M. Lemaire's eyebrows contracted briefly, in a slight frown. Then, forcing a pleasant look to his face, the Frenchman asked, in a toneeasy enough with courtesy:

"Captain Benson, will you step out and talk with me a few moments? Ihave much to say. "

"I can listen, " nodded Jack, looking steadily, shrewdly into the eyesof this male spy. "At the same time, sir, this whole proceeding, meeting, request and all are so unusual that I think you cannot dobetter than to give me a frank explanation of what this all means. "

"Means?" murmured the Frenchman, as though not comprehending. 

"Yes, " retorted Captain Jack Benson, disdaining to beat about the bushfor an instant. "If you pretend that you do not understand me, sir, Ishall feel obliged to have a poor idea of either your honesty or yourintelligence. "

"Are you trying to insult me?" asked the Frenchman, a warning flash inhis eyes. 

"Not at all, " Jack answered, unhesitatingly. "I am asking you for adirect statement. Why am I brought here in this fashion? What iswanted of me?"

The young captain was now paying no attention to Mlle. Nadiboff. She, finding herself not needed in the talk, had slipped out at the otherside of the car, and was now strolling slowly some yards away. 

"Won't you step out, Captain Benson, so we an walk and talk this matterover?" again insisted the Frenchman. 

"Then you have something to say that you don't think quite proper forthe chauffeur to hear?" demanded Benson, almost mockingly. 

"Oh, our good Gaston is all right, " laughed the Frenchman, nodding atthe chauffeur. 

"The chauffeur, then, is one of the crowd--all spies, " flashed throughJack's vengeful mind. "I might have guessed it. And this crowd haveme a long way from my friends. "

"You are not afraid to step down to the ground, Captain Benson?" askedthe male spy, half mockingly. 

"Afraid?" flushed Jack, springing down to the ground and confrontingM. Lemaire. "No; I am not afraid of a regiment like you!"

"I begin to imagine that you are a brave young man, Captain, " assentedM. Lemaire, rather admiringly. 

"Brave?" echoed Benson. "There's nothing here that calls for bravery, is there?"

"No-o-o, " smiled the Frenchman slowly. "Nothing, Captain, but thecourage to do and dare--and prosper. "

"You speak like the puzzle page in a mail order magazine, " laughed JackBenson, more easily. "Now, Monsieur, won't you oblige me by becomingmore definite?"

"What can I say, then?"

"Why, M. Lemaire, I always like to deal with people who are direct andright to the point. You plainly have some kind of a scheme that youare trying to put through with me. Won't you oblige me by comingstraight to the very point?"

"I shall be as direct as you can wish, Captain Benson, " replied theFrenchman, regaining his smile. "Let us stroll. Walking often helpsthe flow of language. "

Out of the corner of his eye Jack noted that, though Mlle. Nadiboffrefrained from joining them, she none the less hovered at no greatdistance from them. 

"Now, my young friend, " began the Frenchman, after a pause of a fewmoments, "you command the submarine boat, and you know all her secrets. You are a draughtsman, to, no doubt?"

"A fair draughtsman, " nodded Jack. 

"You could draw us a model of the boat you command. You could makedrawings of all the important parts. You could supply us withexplanations. "

"Just what sort of explanations?" Jack asked, coolly. 

M. Lemaire shot a swift, sidelong glance at the submarine boy. 

"How?" demanded the Frenchman. "You do not understand yet?"

"You promised, Monsieur, to be very exact and explicit. What do youwant?"

"Why, then, such drawings and such explanations that any skilledshipbuilder, from the plans you furnish us, could build another boatjust like, and just as effective, as the boat you now command?"

"What do you want to do with such plans?" asked Benson. 

"Why, would you care about that, if I pay you well enough?"

"Perhaps not, " muttered Jack Benson. "Still, when I go into anything, I like to know all about it. "

"Well, then, " cried M. Lemaire, gayly, "first of all, we will come tothe question of a fee to be paid you for your trouble. Such drawingsand such papers you could prepare for us in two or three days, couldyou not?"

"I think that very likely, " Jack admitted. He had thrust his handsdeep down into his trousers pockets, in order to restrain his verynatural impulse to spring at the Frenchman and rain blows in the latter'sface. 

"Two or three days' work, let us say, " continued M. Lemaire. "And, forthat we will pay you handsomely--ten thousand dollars in the bestmoney of your land!"

They halted, gazing at each other. For a few seconds Jack Benson didnot dare trust himself to utter a word. When he did speak, it was toask, calmly:

"M. Lemaire, who is your master?"

"My master?" repeated the Frenchman. "I do not understand you. "

"Every dog, even a dirty one, " thundered Captain Jack Benson, "has amaster! Who's yours?"

M. Lemaire's face became livid in an instant. His hands workingconvulsively, he sprang at the young submarine captain. 

Mlle. Nadiboff, snatching a riding whip from under her automobile coat, turned and ran toward them. The chauffeur snatched up a wrench, leapingout of the automobile. 

CHAPTER X

M. LEMAIRE PROVES HIS TRAINING

"You insult me!" screamed M. Lemaire, halting right under the face ofCaptain Jack Benson, who looked at him undaunted. 

"I didn't, " denied Jack. "I let you do that yourself. Mycongratulations, sir. You certainly know how to insult your ownmanhood as well as the most confirmed scoundrel could wish!"

"You insult again!" quivered M. Lemaire, his French accent assertingitself. "I s'all make you pay for zat!"

He struck wildly, badly, as a Frenchman does who has no knowledge ofboxing. Benson merely warded off the blow, at the same time brushingM. Lemaire back a couple of steps. 

"Now, you keep away--Gaston, or whatever your name is!" warned Jack, wheeling upon the chauffeur. "If I lose my temper, some one is goingto be hurt. "

But that defiance served only to draw the chauffeur on. Raising thewrench, he rushed swiftly at the young submarine captain, aiming a blowat his head. 

Just as might have been expected, Jack Benson wasn't there at thatinstant. 

Instead, he dodged nimbly to one side, at the same time driving in ablow that landed under one of the chauffeur's ears. The fellow wentto the ground. Swift as a flash Jack bent over him, and snatched upthe wrench, hurling it off among the trees. 

Then Jack wheeled around to face Mlle. Nadiboff, bowing. 

"Don't you attempt to do anything, I beg of you, Mademoiselle, " Jackurged. "It would come fearfully hard to have to make even the signsof striking at a woman. "

Though she did not fear physical violence from him, there was somethingin Benson's eyes, at just that moment, which caused the Russian womanto retreat three or four steps. 

Now Jack drew himself up, for he was becoming master of himself. He atonce resolved to play this game, if there was to be more of it, withgreater coolness. 

"I think you see, Monsieur, that I am not be frightened by your childishgymnastics, " Benson uttered. 

M. Lemaire, too, had forced himself to greater coolness. 

"Why, Captain Benson, I might even kill, if I found it necessary, "replied the Frenchman. 

"Then don't get any notion that it's necessary, " frowned the youngsubmarine captain. "It would get you into a fearful lot of trouble, and could do you no possible good. "

"But you called me a 'dog, '" pursued M. Lemaire, plaintively. "To aFrenchman that is the gr-r-r-rand insult!"

"Let it go at that, then, " proposed Benson, with a pretense atamiability. 

"Ah! Then you will forget what has just happened, if I will?" cried theFrenchman, eagerly. "That is admir-r-r-rable! Now, then, tenthousand dollars I have said you shall be paid for what you will furnishme. Ah, even in this rich country, one can do much with ten dollars!"

"It wouldn't be much, I'm afraid, as compared with my prospects with thePollard Company, " replied Captain Jack, with his most thoughtful air. 

"Your prospects with the company?" echoed M. Lemaire. "Why, my brightyoung captain, your prospects with the company will continue just thesame. They will never know that you have taken this little fortunefrom me. Ten thousand dollars! Think of that!"

"And you'd turn around and sell what I'd, give you for a half a million, very likely. "

"Oh, no, no, no!" disclaimed the Frenchman, solemnly. "There would benothing like that in it for me. "

"Then no foreign government wants very badly to know about the Pollardplans, " inquired Jack. 

"There is no government that would pay a really great fortune for suchinformation, ". M. Lemaire assured the submarine boy. 

"There is one, " retorted Captain Jack, with a cunning smile. 

"Which one?" demanded the Frenchman, doubtingly. 

"One that you don't happen to represent, " laughed Jack, quietly. 

"Ah, I much doubt it, though I beg you to pardon me for saying so, Captain Benson. "

"Why man alive, " grumbled Jack, "are you running away with the notion thatyou're the only one who ever approached me with a view to finding outhow the Pollard boat runs? You claim, to be a spy for some othergovernment, M. Lemaire. Are you such an infant as to think yourselfthe only spy in the field?"

"You would have to tell me about the others. Name them, or describethem to me, " urged the Frenchman. "Then I would know, if they are realagents of any foreign government. "

"I would tell you nothing of the sort, " muttered Captain Jack. "I amyoung, perhaps, yet I'm old enough to keep my own secrets. "

"Then it is agreed, anyway, " hastened on the Frenchman, "that, in threedays, you will have ready the plans and descriptions, and that I, afterI have looked them over and have found them satisfactory, will hand youten thousand dollars. "

"If you've made any such agreement, " laughed Benson, "then you've madeit with yourself only. You certainly haven't made it with me. "

"Don't you agree, then?" asked M. Lemaire. 

"No, " said Jack, shortly, turning on his heel. 

"Where are you going, Captain?"

"Back to Spruce Beach. "

"On foot?"

"Yes, for I know your kind too well to suppose that you'll offer me aride back. "

"Wait!" cried M. Lemaire, persuasively, and Benson, halted, looking athim. "Of course I cannot offer you a lift back to town, " continuedthe Frenchman, smilingly, "for that would be ungallant. But Mlle. Nadiboff, who had the pleasure of your company out here will, I know, be most delighted at having your company on the return. "

"Assuredly, " added the young Russian woman, with one of those charmingsmiles that had failed so utterly with the submarine boy. "I shallfeel most offended if Captain Benson does penance by walking all themiles back to Spruce Beach. "

"I'd be a fool, then, to take that long walk back, when I can ride, "thought Captain Jack. 

So he turned, retracing his steps and bowing to the young woman. 

"Yet, before we start, " proposed M. Lemaire, anxiously, "let us see, Captain, if we cannot yet come to some arrangement. "

"Well?" demanded Jack, for boyish curiosity tempted him to find howfar this Frenchman was willing to go. 

"Captain Benson, " proposed Lemaire, "let us say that the price for whatI ask shall be fifteen thousand dollars. "

"You're not getting anywhere near my price, M. Lemaire, " laughed thesubmarine boy, derisively. 

"You are playing with me--laughing at me!" cried the Frenchman, yet hespoke cheerily, for now he began to hope that this American boy mightyet be induced to sell himself, body, soul and honor. 

"We may as well drop this line of talk, " hinted Jack Benson. "You weregood enough to offer me a ride back to town, I believe?"

"Yet the price? Let us settle that first, " begged the Frenchman. "Captain Benson, I will make you one more offer--but it must be thelast. Listen!"

Yet that word was followed by three or four utterly mysterious words, uttered in a low voice in Arabic. 

"Yes, " nodded Mlle. Nadiboff, as Jack glanced from one to the other, "but this must be the last offer. "

"The last, the only, the highest offer, " muttered Gaston, who hadrecovered from the blow Captain Jack had given him. 

"Well, then, Captain Benson, bring me your plans within three days, withall the other data needed for the construction of one of your submarineboats, and I will hand you, in exchange, the sum of twenty thousanddollars. There you are, my good friend! Twenty thousand dollars. Nowyou are ours, are you not?"

Disgusted, yet crafty, Jack Benson pretended to hesitate. 

"You must give me your answer at once, " demanded M. Lemaire. "I cannotbe played with any longer. "

Captain Jack drew himself stiffly erect, looking the Frenchman full inthe eyes. 

"M. Lemaire, you must have been a spy for a good many years. You havebeen engaged so long in dishonest transactions that you are unable tounderstand such a thing as common honesty. "

"Do you call it honesty, " demanded the Frenchman, with a bitter smile, "to demand more than twenty thousand dollars for such an easily performedservice?"

"You idiot!" broke forth Jack, in sudden contempt. He was no longerable even to play with this rascal. "Your offer is just as good as oneof a million dollars would be. I wouldn't take either!"

"What! You have been trifling with me?" demanded M. Lemaire, startingforward. 

Now the meaning of those few words in Arabic became plain enough. ForMlle. Nadiboff, who had bent over, her hand toying with the sand, suddenly clutched a handful of the fine grains and straightened up, hurling the sand full in Benson's face. 

In that same flashing instant Gaston darted behind the young American. As the half-blinded young captain dodged back, the chauffeur caught himaround the neck, dragging him to the ground, while Lemaire sprang a-topof the boy. 

Jack fought desperately enough, but the two men rolled him over, struggling to hold his hands. Then--

Click! Snap!

Jack Benson's wrists were handcuffed tightly together. 

Now M. Lemaire leaped up, looking down gloatingly at the boy. 

"Benson, you young fool, " scoffed the Frenchman, "since you refuse tobe treated as a friend, you shall know what it is to have us for yourenemies. You deem it easy to laugh at us--to call us names! Bah!You will soon be glad to beg from us! Your hours of misery are nowbefore you--perhaps days of torment that shall end in madness. Defyus? Balk our plans? Pouf? How little you know of the people withwhom you have now to dealt. "

Then, at a sign from Lemaire, Gaston threw himself upon Benson's legs, swiftly binding the ankles together. This done, Lemaire himself addeda gag to Jack's mouth that shut off the last chance of making a sound. 

This done, the two men bore Captain Jack to the larger auto, whileMlle. Nadiboff, chuckling softly, covered him completely under robes. 

CHAPTER XI

JACK'S FRIENDS DO SOME FAST GUESSING

"So that's the kind of people they are?" Jacob Farnum smiled softly asReporter Hennessy finished repeating the information volunteered by Mr. Graham, the Washington correspondent. 

To this Hal had contributed the little he was able to tell of Mlle. Nadiboff's conduct. 

"You will have to look to your young captain more closely after this, "wound up Hennessy. 

"Why?" questioned the shipbuilder. 

"Even at this moment he is away in the company of that clever woman. "

"Oh, he won't be cross with her, " retorted Farnum, with an easy smile. "Jack Benson is always courteous with women. "

"But aren't you afraid your young captain will have his head turned byher?" pressed the reporter. 

"Who? Jack?" laughed Mr. Farnum. "Say, it's very plain you don't knowJack Benson. "

The shipbuilder, two of the submarine boys and the reporter were seatedby themselves at one end of the Hotel Clayton's big front veranda. 

"Aren't you at all uneasy?" asked Hennessy. 

"If I am, " proposed the shipbuilder, "I'm going to cure my mental unrestwith luncheon. Won't you join us, Mr. Hennessy?"

If appetite were any guide, none of the submarine people felt theslightest uneasiness as to information that the sprightly Mlle. Nadiboffmight be able to coax from Captain Jack while on that auto drive. 

By the time that the quartette came out again, however, Farnum began tolook bothered. 

"After two, " he declared, "and Jack not here. Now, at three o'clock, I've agreed to take out a party of naval officers from the gunboat. Wewant to show those Navy fellows some of our prettiest work in the'Benson. '"

"It looks as though your young captain is finding his companion sopleasant that he forgets to look frequently at his watch, " suggestedthe reporter, slyly. 

"Jack Benson doesn't know anything about the three o'clock appointment, "replied Mr. Farnum. 

"If he isn't here in season, " put in quiet Hal, "it won't cause us anyreal trouble, anyway. Those of us who will be on hand can manage theboat through any ordinary trial or trip. "

Eph was very silent--for him. After fifteen more minutes had gone byyoung Somers sauntered out into the road, where he could command a longview in the direction in which he would naturally look for Jack'sapproach in Mlle. Nadiboff's car. 

After some ten minutes Eph Somers came running up the roadway. 

"It's all right, " he announced. "The car is coming. "

In hardly a minute more the car rolled up to the veranda, and stopped. Mlle. Nadiboff, catching sight of the little party, smiled and noddedgraciously as she stepped to the veranda. 

"Where's Captain Benson?" inquired Hal, starting toward her. 

"Captain Benson?" repeated Mlle. Nadiboff, looking a trifle surprised. "Hasn't he returned?"

"Not yet, " Hal Hastings answered her, his gaze fixed steadily on theyoung woman's face. "How could he return ahead of your car, Mademoiselle?"

"Why, he left me more than half an hour ago, and within two miles ofhere, " replied the young woman, easily. "I proposed going to anotherhotel, a few miles from here, for luncheon. So he asked me to puthim down, saying he would walk in. That was not more than two milesfrom here, was it, Gaston?"

"Much less than two miles, " replied the chauffeur. 

"And he hasn't returned?" queried Mlle. Nadiboff, looking mildly curious. 

"He has not yet come, " Hal replied. 

"Then he must be a slow walker, or--but will you take my car and goback to look for him? Will take you to the spot where your youngcaptain left us on foot?"

Hal Hastings's first impulse was to accept the offer of the car. YetMlle. Nadiboff's acting was so perfect, her air so unconcerned save formild curiosity, that any suspicion Hal may have felt for a second or twowas quickly banished. 

"No, though I thank you, Mademoiselle, " he replied. "Captain Bensonwill doubtless be here before we could make a fair start. "

Nodding pleasantly, the Russian vanished through the ladies' entrance. Hal went back to his companions. 

"Say, " broke in Eph, presently, "if she left Jack to go several milesfor her luncheon, she got it and returned mighty quick. "

"Probably used a woman's privilege, and changed her mind about drivingto that other hotel, " suggested Mr. Farnum. 

For some minutes more the party waited, then went down into the road, but there was no sign of Jack coming along. 

"Mighty strange!" muttered Hal, uneasily. "Well, we've got to aboard, now, " announced Jacob Farnum, after glancing at his watch. "Sorrywe can't very well invite you to go with us, Mr. Hennessy. "

"I shall see you, if you come ashore in the evening, " replied thereporter. "In the meantime I shall be about the hotel. If I seeBenson, I'll tell him where you all are. "

Being well provided with cigars, Reporter Hennessy did not quit theveranda after he had once taken his seat there. So it happened thathe noted the arrival of M. Lemaire, alone in a runabout, just about anhour after the time when Mlle. Nadiboff had returned. 

Jack Benson, however, did not put in an appearance. 

The submarine torpedo boat, with its naval party aboard, sailed out ofthe harbor, returning just before dark. 

Then, as soon as could be, Messrs. Farnum and Pollard and Hal and Ephcame ashore, heading straight for the hotel. 

"Your young captain hasn't succeeded in walking the two miles' distanceto this hotel, " announced Mr. Hennessy, who was waiting for them. 

"Confound it, I don't like the looks of this, " muttered Farnum, uneasily. "It looks as though something had been done to Benson. "

"Will you notify the police?" questioned the reporter. 

"I don't believe that would be wise. At any rate, not quite yet, "interposed Hal. 

"Then what would you do?" demanded Mr. Farnum, turning upon the youngengineer. 

"If Jack has come to any misadventure through that pair of spies, "uttered Hal, anxiously, "it seems to me it will be a heap more promisingif we keep a sharp, unseen watch over every move made by M. Lemaireand Mlle. Nadiboff. "

"Right-o, every time!" clicked Eph. "If anything has happened to goodold Jack through that pair, then they're the only ones to be watched!"

Dinner, that evening, wasn't as confident a meal for the submarineparty as luncheon had been. Both Mlle. Nadiboff and the Frenchmanwere in the dining room, though they did not sit together. 

Later, the young Russian woman appeared in the ballroom. She was aseagerly sought as a partner as she had been the night before. 

Farnum and his friends did not enter the ballroom, not having broughtevening dress ashore with them. 

Yet, some of the time, they remained near the entrance to the ballroom. It was here that M. Lemaire, in evening clothes, saw them and bowed mostamiably. 

"You do not care for the gaiety of the dance?" he inquired. 

"No, " replied Jacob Farnum, evasively. "We are looking for CaptainBenson, and thought it just possible he had entered the ballroom. "

"Did he not tell you, this afternoon, whether he would be at the dance?"Lemaire inquired, in a tone of polite curiosity only. 

"We didn't see him this afternoon, " replied Mr. Farnum, rather curtly. 

"You astonish me, " cried the Frenchman. 

"In fact we have not seen Captain Benson since we left him on anautomobile ride this morning. "

"Ah! I had not heard of that, " murmured the Frenchman. "I trust nothingis wrong with the gallant young fellow. "

"Oh, that's hardly likely, " drawled Jacob Farnum, with an effort. "Captain Jack Benson a lad with a pretty good idea of how to take careof himself. "

While speaking Farnum did not look particularly at the Frenchman, buttrusted to the boys to watch the man's face covertly. M. Lemaire, however, proved to be a good actor and a master of facial expression. 

As soon as he could, without attracting attention, Jacob Farnum drew hislittle force to one side. 

"Something serious has happened to Jack, " muttered the shipbuilder, moodily. "It may have been an accident, but I believe it's ten timesmore likely that that infernal gang of spies have trapped the lad andbrought harm to him. We've got to act, and act fast!"

CHAPTER XII

IN THE POWER OF THE SPIES

Something had, indeed, "happened" to Jack Benson, and much more waslikely to happen. 

The young submarine captain lay on a pile of dried grass that had beenthrown on a board floor. His hands were still manacled. Worse, one ofhis feet now had an ankle-ring fastened securely, and this was chainedto a stout staple driven in the floor. 

It was a curious place in which young Benson lay, a place with a strangehistory. 

Years before a tunnel had been bored into the side of a hill. Afterthe tunnel had been lined with a masonry of stone it was not more thanthree feet in diameter. This tunnel led into an artificial cave someeighteen feet square and nine feet high. This cave had been shored upand boarded as to ceiling, floor and walls. 

A great deal of labor had been expended in building this curious placeunder a low hill. Yet the original builders had figured that their timeso spent would yield large returns. This part of the Florida coast layconveniently near to Cuba. On moonless nights a small sailing craftwould put in along the coast, laden with smuggled Havana cigars. Therebeing no safe place along the shore in which to store the cigars, thisplace, hidden well in a forest, had been constructed as a safedepository. For some time the cigar smugglers had prospered. Then, aswas to have been expected, Uncle Sam's sharp eyed customs men ran theillegal business down, arresting the smugglers, all of whom weresubsequently imprisoned. 

For a while afterwards this cave had been visited by the curious. Allthis smuggling, however, was now a thing of many years past, andcuriosity-seekers had come to leave the place alone. 

M. Lemaire, however, in studying the surrounding country, had heard ofthe artificial cave. He visited it. At need, he saw that it would suithis purposes. And now Jack Benson lay there, having been brought hitherin Mlle. Nadiboff's automobile. 

The young submarine captain was now not gagged. He had yelled for helpperhaps two hundred times in the long hours since his enemies had lefthim there. Yet there had been no response. Benson was now willing tobelieve that there was now no likelihood whatever of his being able tosummon help. 

Unable to consult his watch, and lying there in complete darkness, thesubmarine boy had lost track of time. It was now nearly two in themorning. He had not eaten since early the morning before. He wasfamished, and, what was much worse, was parched for want of a drinkof water. 

"I wonder if they intend to leave me here to die?" thought Jack Benson, for perhaps the five-hundredth time. "It would be fiendish. Yetlooking for mercy in Lemaire would be like looking for a lake of purewater in the Sahara. "

Jack shifted, as much as the chain at ankle would permit. He groanedwith the discomfort of it all. 

As if in answer there came another groan, low, hollow, yet unmistakable. Captain Jack raised himself on one elbow, listening keenly. The groanwas repeated. 

"Who's there?" he called. 

By way of answer there came still another groan. It was hollow, gruesome, and suggested the grave itself. But Jack Benson was ahealthy, intelligent boy, with sound digestion and well tuned nerves. 

"If you're trying to work any ghostly trick on me, " called Benson, derisively, "try something else!"

Again the groan, a bit louder, but Jack's answer was a merry, ringinglaugh, in which there, was not a trace of dread. 

"Thank you for the company, Mr. Groan, " he called cheerily. "I wasbeginning to feel a bit lonely. But say! Can't you bring a light--evena ghostly one?"

"I am the spirit of Paul Jones, " breathed a low, wailing voice. 

"Oh nonsense!" jeered Jack. "Paul Jones never spoke with a cheapFrench accent. "

"I come to--to warn--you, " sounded the same sepulchral accents. 

"Bring the warning right in and let's have look at it, " begged Jack, heartily. Some convulsive sobs sounded out by the passageway. 

"Oh, say, " chuckled Jack, "as a vender of blood curdling noises you'rein need of repairs. Listen! I'll sound a much better line for you!"

With that, and in a deep, blood curdling voice, Captain Benson startedin on the first verse of "Down among the dead men. "

He was interrupted then by a more tangible sound. Beyond, a match wasscratched. Then a lantern was thrust in from the low tunnel, followedby the appearance of the rather long body of Gaston, the chauffeur. 

"I thought my singing would bring something, " chuckled Jack. "In alarge town it always brings the police. Well, how are you? I'm reallyglad to see anything human, and I suppose you'll answer to thatdescription, eh?"

In silence the chauffeur stepped forward resting the lighted lantern onthe floor a few, feet from the boy. Then the Frenchman seated himselfon the boards, next bringing out a paper package from one of hispockets. As he untied the string Jack watched with lively interest. 

"Sandwiches, eh?" chuckled Jack. "Thank you. I'm ready. "

"This is my supper, " answered Gaston, taking a bite of one of thesandwiches. "You don't get any. "

"Oh, I don't?" demanded Captain Jack, feeling the pangs of hunger worsethan ever. 

Gaston's next move was to take a bottle from another pocket, uncorkingit. 

"As you're a Frenchman, I suppose that's wine, " muttered Jack. "I don'tuse that kind of stuff, but water--"

"This is water, " replied the Frenchman, pouring a few drops onto thefloor before the submarine boy's eyes. 

Jack's throat ached at sight of the water. "I suppose you've come hereto eat and drink, in order to torment me?" asked Captain Benson. 

"It must give you huge pleasure to watch me, " suggested Gaston, taking aswallow from the bottle. 

"About the only pleasure I could get from watching you, " retorted theboy ironically, "would be if I could see you swinging from the end ofa rope that was tied in a tight noose around your neck!"

"Perhaps that will happen to you--yet, " hinted Gaston, looking keenlyat the boy. 

"Humph!" muttered Jack. "How would that help your rascally crowd?"

It was plain that the chauffeur didn't really want to eat or drink, butthat he had been tormenting the captive. Now Gaston carefully placedthe sandwiches and the bottle of water where young Benson couldn'tpossibly reach them. 

"You've been having too pleasant a time here, " glared the Frenchman, bending over the boy. "You haven't yet suffered enough to be ready forthe plans that we have for you. "

With that the chauffeur threw himself a-top of the boy, striking hima blow in the face. 

"You lean, long-legged coward!" sneered Jack, angrily. "You know abouthow much punk you'd have if I had my hands and legs free, and stoodbefore you on even terms. How you'd beg, you wretched craven!"

For answer the chauffeur clutched with both hands at Jack's hair, givinga hard pull. Jack gritted his teeth, panting, until at last thetorment forced him to utter a pain-wrung "ouch!"

"Perhaps you will soon learn better than to insult me, " leered Gaston. 

"You wretched dog, " shot back the submarine boy, "you're past insultby any decent man!"

"Careful, " warned the Frenchman, "or I will soon make you shriek yourapologies to me. I can do what I please with you, and sometimes I havean ugly temper. But listen. I come for one purpose only--to find outwhat answer am to take to my master, M. Lemaire. "

"Take him, " retorted Jack, dryly, "the assurance of my undying contemptfor him and all of his kind. "

"You will be left here another twenty-four hours, without food or drink, if you do not give me a better answer to take, " warned Gaston, leeringdown savagely into the boy's face. "Now, consider! Will you send wordthat you will be glad to see M. Lemaire in the morning?"

"Yes; if he's going to be in state prison, " mocked Benson, "and lockedin a cell, as he should be. "

"Will you see him here?"

"I can't help myself. "

"If M. Lemaire comes, will you be sensible? Will you tell him all thathe wants to know about your boat and your work?"

"Not if I'm in my right mind!"

"If you continue stubborn, Captain Benson, you will die here, of thirstand hunger. "

"Perhaps, " admitted Jack, more soberly. "But it will be a full-sizeman's death, won't it?"

"Oh, you think, then, that you are not afraid to die of thirst andhunger?"

"Since others have done it, " retorted Jack, "I suppose I can, if Ihave to. "

"If you have to?" rasped the Frenchman. 

"Do you doubt, then, that we would bring such a fate upon you?"

"I don't believe there's anything too low and cowardly for your crowdto stoop to it, " admitted Jack Benson, with spirit. 

"Have a care, young man!"

"You asked me a question, " growled back young Benson, "and I answeredyou. If it doesn't suit you, don't ask any more questions. "

Gaston regarded the boy with a still more sinister look. 

"I think, Captain, " continued the chauffeur, "that a little pain--willhave a good effect in disciplining you. "

Jack Benson did not reply. 

"Come, now! Let us see if any of your hair will stay in your scalp?"proposed the Frenchman. "Yet, first of all, boy, have you anything tosay that will stop me?"

"If I had, I'd say it, " muttered the submarine boy, ruefully. 

"Then you might give me that message I asked for. "

"Is that all that will stop you?" demanded Jack. 

"Yes. All. "

"Then go ahead with whatever you have in mind, " retorted Jack. "As longas my sane mind stays by me I shall never betray the Pollard secrets toany other government!"

"Let us see, then!"

Once more Gaston fastened the long, sinewy fingers of each hand in thesubmarine boy's hair. He began to tug, gently at first, but graduallyincreasing the force of the yank. 

Jack Benson stood it as long as he could, then at last let out a yellthat was dragged from the depths of agony. 

"I'm in time, it seems! Stop that! Now, turn and fight like a man--youcontemptible hound!"

It was Hal Hastings's voice that rang through the little cave. Hal hadjust crawled in through the tunnel. Now, the young engineer, his frameshaking with indignation, stood up at nearly his full length, preparedto spring upon Gaston, who, also, had leaped to his feet. 

"I thought it would be worth while to watch and shadow you to-night, "jeered Hal, angrily. "It turns out I was right. The bushes plantedbefore the mouth of the tunnel bothered me, a while, in finding the wayin here after you--_but now I'm here!_"

Of a sudden Hal leaped forward, intent upon pouncing on the chauffeur. But Hal's foot caught in a break in the flooring. He pitched and fellforward. 

With a snarl of glee Gaston burled himself upon the prostrate body ofthe second submarine boy, pounding him furiously. 

CHAPTER XIII

THE FELLOW WHO SHOWED THE WHITE FLAG

Hal lay face down, and subjected to all the brutal fury of theFrenchman's assault. 

For a few seconds young Hastings did all in his power to fight back. He was rapidly losing consciousness, however, and poor Jack lay unableto lend as much as a finger's weight to the defense of his chum. 

Then, with an oath in a foreign tongue, Gaston forced Hal's hands back, snapping handcuffs on the engineer's wrists. 

"Now, then, you young pest!" snarled Gaston, springing to his feet. "Instead of one of you, I have two. But two shall give me no moretrouble than one. So you thought you could subdue me--_me_, did you?"

"I'd have thrashed you all right, " muttered Hal, his senses returningunder the storm of taunts, "if my foot hadn't caught and thrown me. You wouldn't dare to free my hands and let me to my feet, just to seewhat would happen to you! You can't fight--unless all the advantageis handed to you. You're a coward--not a fighter!"

"Careful, my young firebrand, or I'll teach you to be more polite tome, " sneered the Frenchman. 

"Polite to you?" jeered Hal. "Polite to a spy--to a thief of nations!Polite to a scoundrel who wants to steal the biggest secret of defensethat the United States Navy has!"

"Oh, we'll have your secret all right, " announced the Frenchman, hisvoice harsh with triumph. "We now have the two boys who know all aboutthe secrets of the Pollard boats!"

"This sounds so good, I reckon we'd better go right on in, Jerry, " brokein another voice. 

Gaston started, as did the two submarine boys. Then the chauffeurleaped to the mouth of the tunnel, only to draw back in dismay as abig form emerged and loomed up before his startled vision. 

The last comer wore the dress and insignia of a petty officer of theUnited States Navy. 

"Get back there!" warned this big apparition, waving a warning hand thatlooked big enough to be a ham. "Nobody can't go out until we look intothis cargo. "

After the big sailor a smaller one crawled out of the tunnel, risingto his feet. Though he was smaller, this second sailor was not exactlywhat could have been called a little man. 

"Now, then, " demanded the big sailor, "whose captain of this craft?"

Gaston, his eyes threatening to bulge from his head, had fallen backagainst the wall opposite. His mouth was wide open, but he venturedno answer. 

"Stow my sidelights, Jerry, " muttered the big sailor to his mate, "but this is a queer looking hold! And two young men here who'd looklike officers of the service, if they wasn't so young. "

"There never was anybody more delighted to you, " broke fervently fromJack Benson's. "You belong to the 'Waverly'?"

"Aye, aye, shipmate. "

"Then you know the submarine, of course?"

"Aye, shipmate. "

"I am the captain, and my friend the engineer, of that craft. "

The big sailor's reply was an explosive yell. 

"Don't let that snake-in-the-grass Frenchman get away, mates, " beggedJack, earnestly. 

"Jerry, I reckon you can hold the only gang way that opens in on thisplace, can't ye?" demanded the big sailor, turning to his sturdy lookingshipmate. 

"I reckon, Hickey, " said the other. 

"This Frenchman is one of a gang of foreign spies, who have taken thismeans to force us to furnish plans, drawings and all information aboutthe Pollard submarine boats, " Jack continued. "You see how he has usironed down here. "

"Got the keys to them irons, Frenchy?" demanded the big sailor, turningupon Gaston. 

"Yes, " shivered the fellow, looking yellow with fright. 

"Then turn our shipmates loose. Not too much delay about it, either, "ordered Hickey. 

Gaston obeyed as meekly as a lamb. There was a look in Hickey's steadyeyes which would lead one to suppose that the big sailor might be ableto use his strength in tearing a worthless human being apart. 

"I hope you can understand all the thanks I feel like giving, " remarkedthe young submarine captain, as he rose to his feet, then offered hishand to the big sailor. 

"Oh, stow the thanks, anyway, " laughed Hickey. "But Jerry and me ain'tin for what we thought might be coming to us. "

"What was that?" asked Jack, with interest, turning back as he held outhis hand to Jerry. 

"Why, ye see, " nodded Hickey, after glancing down at the Frenchman, whowas now unlocking Hal's handcuffs, "I've got a home, a little plantationabout two miles back here, that I'm going to settle on for good one ofthese days. The wife and kids live there. I'd been telling Jerry aboutthe craft and crew, and, as soon as we got shore leave, I took Jerryin tow. We've seen up there two days, and to-night we started backthrough the woods, 'cause our leave is up at six in the morning. 

"Well, while we was coming through the woods we happened to stop aminute. Then we see this Frenchy sneaking through the woods. Wewondered what was up. Then he vanished. We looked about, somequiet-like, and on tiptoe, and then we saw this shipmate o' your'npry apart some bushes and head in this way. It looked queer to us. "

"What did you think was up?" asked Jack. 

"Why, as near as we could figger, this was some smuggler's hidin' place, and we was figgerin' that perhaps Jerry and me would have five 'hundredor a thousand dollars' reward to divvy up on. It wa'n't--but, anyway, Jerry an' me are proper glad we stumbled in on this, just the same. Now, mate, spin yer own yarn. "

Hal was on his feet, by this time, and shaking hands with the tworescuers. Gaston, at the furthest end of the little room, again coweredagainst the wall, frightened and surly. 

Jack Benson told as much of the story as he thought wise, though he feltit best to leave out the names of M. Lemaire and Mlle. Nadiboff. 

Next Hal described how, at the hotel, he had set himself to watchingGaston; how he had shadowed the fellow. 

"Did he come out here in an auto?" asked Jack. 

"No; if he had, I couldn't have followed, " Hal responded. "But thisplace is barely four miles from the hotel. We can get back in an hour. "

"What ye goin' to do with this feller, anyway?" demanded Hickey, jerkinga thumb in the direction of the frightened Gaston. 

"Turn him over to the police, " spoke Jack, promptly. "Even if we failto prove anything else Hal can help me fasten a charge of feloniousassault on the scoundrel. That will be enough to keep him locked upfor a couple of years to come. "

Gaston heard this with a falling jaw, though he did not venture to sayanything. 

"Well, Jerry and me are ready whenever you are, mates, " hinted bigHickey. 

Jack nodded, and they filed out, Jerry coming last of all to make surethat the Frenchman did not lag behind. 

"Now, stand up, me bucko, " ordered Hickey, seizing the chauffeur'scollar as that worthy crawled through the bushes at the outer end ofthe tunnel. "Tryin' to steal submarine secrets, was ye? So someforeign nation'd have the trick of blowing our battleships to pieces, and the sailors on 'em? Jerry, wot d'ye reckon 'ud be about rightfor Frenchy!"

"Pass him over to me and I'll see, " grinned the smaller sailor. 

Hickey grasped the frightened chauffeur in both hands, then fairlyhurled him at the smaller sailor. Jerry struck him once, with eachlively fist, then sent the fellow spinning back to Hickey. The lattercaught Gaston, tossing him up in the air, then striking him hard as thefellow came down. This done, the chauffeur was again hurled back atJerry. For some time the two sailors kept this up. It was rough, heavy punishment. Gaston bellowed like a sick bull under all thestrenuous handling. He must have ached in every bone in his bodywhen Hickey finally caught him, on a rebound, and held him off atarm's length. 

"Had about enough, Frenchy?" demanded the big sailor. 

"Oh, mercy, monsieur!" panted the fellow wailingly. "I have had muchplenty to last me all my life. "

"I wish I knew whether ye was lyin', " muttered Hickey, thoughtfully. "I don't feel a bit tired, yet. Do you, Jerry?"

"Me? The exercise has warmed me up fine, " grinned the smaller sailor. 

"Mercy, messieurs, mercy!" wailed Gaston, sinking down to his shakingknees, for he feared that these grim tormentors meant to kill him. 

"I'd just as soon you'd let up on the scoundrel, if you don't mind, mates, " broke in Jack. "You see what a cur he is when he isn't havingit all his own way. I told him, back in the cave, that he'd be justthis sort of a fellow if the tables happened to be turned. "

"Did ye say ye was going to turn him over to the officers?" askedHickey. 

"Yes, " spoke Jack Benson, decisively. "A fellow plying the trade ofthis one needs to be locked up as long as possible. "

"Oh, no, no, no, my brave Captain!" implored Gaston, wobbling aroundupon his knees so as to face the submarine boy. "Not the jail! Notthe prison! Me! I have always been as free as the birds of the air. I would die in prison. "

"I can't see where much loss will come in if you do, " retorted Jack, coldly. "Hal, you brought the handcuffs out with you?"

He held up both pairs. 

"No, no, no!" pleaded Gaston, almost tearfully. "Not such disgraceas that!"

"Let me have a pair of the bracelets, " requested Hickey, holding outone of his hands. "Now, my tine bird, let me clip yer wings. "

Gaston submitted meekly enough, then was dragged to his feet. 

While Hal had brought out the lantern and the handcuffs, famished, thirst-tormented Jack Benson had looked after the water bottle and thesandwiches. Now, as all hands trudged along toward the beach theyoung skipper ate and drank to his full content. 

Arrived in town, they roused a cottager. From him they learned whereto find the police station. Gaston was thrown into a cell, and Jackentered formal complaint against the fellow. 

Jacob Farnum still awake, was found at the hotel. When Hickey and Jerryreturned aboard the gunboat neither felt so sorry about not havinglocated a smuggler's camp in full operation. Jacob Farnum had takenthe sailor pair apart, presenting each with a hundred-dollar bill. 

CHAPTER XIV

A REMEMBRANCE FROM SHORE

It was a drowsy looking submarine party that retired to a room in thehotel to talk over the situation. 

"Now, of course, first of all, " declared Jacob Farnum, "we must takeword of this whole affair to the commanding officer of the gunboat. Asthe representative, here, of the United States Government, he can giveus some advice as to what to do. I am wondering whether M. Lemaireand Mlle. Nadiboff can be arrested. "

"Hal, " demanded Jack, turning to his chum, "when you were prowling aboutat the cave, did you hear Gaston mention the name of M. Lemaire?"

"No, " replied Hastings, shaking his head. 

"Then there wouldn't be any witness to confirm my testimony, " sighedCaptain Benson. "Without such a witness to aid me, I don't see how wecould expect to prove anything legally against M. Lemaire. "

"As for that pretty young Russian woman--" began Mr. Farnum. 

"We haven't a single line of proof we could put out against her, "interposed Benson. "She will have to escape, I am afraid. For thatmatter, I'd hate to help in the prosecution of a woman. "

"So would I, " retorted Mr Farnum. "Yet, if she is helping to underminethe secrets of the United States Government, something will have to bedone to stop her. "

"Perhaps, " hinted Jack, "the best thing to do will be to see thecommander of the gunboat. "

"Much the better course, " observed David Pollard, who, during the lastfew moments had seemed dreamily silent. "As you yourself suggested, Farnum, that officer should be consulted before a single step is takenin the matter. "

"Then we'll all go down to the shore, " decided the shipbuilder. "Evenat this hour we shall find a boat. "

Ten minutes later the party had clambered up on the platform deck ofthe "Benson. " Williamson, having been left to sleep there alonethrough the night, had secured the entrance to the conning tower. A few sound thumps on the deck, however, roused that machinist, who, donning slippers and trousers, quickly ran up the spiral stairway, admitting them. 

"I'm mighty thankful to see you back, Captain, " was the machinist'sgreeting. 

There being still nearly two hours of time to elapse before a call couldwell be made aboard the gunboat, Jack and Hal threw themselves into theberths of one of the staterooms. That brief, sound nap proved thesaving of them when, finally, with Messrs. Farnum and Pollard, they wenton board the "Waverly. "

Lieutenant Commander Kimball received them in his own cabin, hearingJack's story with utter amazement. 

"What I advise you to do, gentlemen, is to go ahead and prosecute thefellow Gaston on the charge of felonious assault. I would, however, try to avoid having any testimony brought out in court to-day. I willsend one of my officers to see the public prosecutor, and ask thatofficial to have the case continued for one week. I will also wire theNavy Department at Washington, and await the reply of the Secretarybefore taking any other steps or offering you any other advice. But donot needlessly alarm Lemaire or the young woman away from here. "

So well did the lieutenant commander accomplish his purpose that, whenJack and Hal went to the local court that forenoon, the publicprosecutor promptly asked to have the case against the chauffeurcontinued for one week, and the court as promptly assented. 

Gaston was taken back to jail. Though the fellow was well supplied withmoney, he did not have anywhere near enough to put up the five thousanddollars cash bail demanded by Florida justice. 

At the jail a watch was kept to see whether Gaston would have visitors, but none came. M. Lemaire and Mlle. Nadiboff were known to be still atthe hotel, but they did not go near their man in trouble. Neither didLemaire or the Russian appear about the grounds of the hotel. 

At noon a letter from Lieutenant Commander Kimball came aboard thesubmarine, inquiring whether Captain Benson could make it convenientto take him and several officers out to sea afternoon and give anexhibition of the boat's diving powers. 

"After we've taken the boat out ourselves, and tested her, " was theanswer Captain Jack sent back. "With so many spies about we want to besure that the boat is in safe running order before we risk the lives ofhalf a dozen naval officers. "

A luncheon was eaten, after which, the young submarine captain hastilyclimbed the stairs to the conning tower. 

"Throw on the gasoline, Hal, " he called back over his shoulder. "And, as soon as we get way, test all the electric connections, before weattempt to do any diving. Be sure of everything old fellow. "

Forward in the engine room the gas motors were soon moving merrily. Bythe time that Eph had cast loose from moorings Jack signaled for slowspeed ahead, and the grim-looking little Benson moved on out of theharbor. 

Once out of the harbor Captain Jack rang, successively, for two higherspeeds. The "Benson" answered both like a charm. 

"The gasoline part of the craft is working all right, " declared theyouthful skipper to Eph, who had come up into the tower. 

Fifteen minutes later Hal shouted up:

"All electric connections appear safe, Captain. And all the aircompressors are working. "

"Are you ready to shut off the gasoline motors?"

"Yes, sir. "

"Go ahead, then, and we'll take a dive. " Down they shot below thesurface, the boat going on a diving keel. Then, for some minutes, Captain Jack ran his submarine pride along at a depth of fifty feetbelow surface. 

"Might as well rise, Captain, " called up Mr. Farnum, coming from hisstateroom. 

So Eph, at the young commander's orders, stood by to let the compressedair gradually into the water tanks. As gracefully as ever the "Benson"rose to the surface. Gasoline power was turned on again. 

"Everything is all safe, Captain, " nodded Mr. Farnum. "Run back and getyour naval party. "

As they were to run, now, on the surface, Jack stepped out to standby the deck wheel Eph and Hal came out with him, David Pollard standingfurther aft. 

As the submarine rounded in under the gunboat's stern the voice ofKimball called:

"As well done as ever, Mr. Benson! When shall we come on board?"

"As soon as we're moored, sir, " Jack shouted

As the "Benson" ran to her moorings the youthful captain espied a shoreboat that bore, as sole passenger, one of the uniformed, colored bellboys from the hotel. 

When Eph made the mooring cable fast, this shore boat ranged alongside. 

"Box for Captain Benson, sah, " called the negro. 

"Right here, " acknowledged Jack, going over to the rail. The boxproved to be of pasteboard. 

"Are you going to open it?" whispered Farnum. 

"Why, yes, sir; of course, " Jack answered. 

"Better do it on deck, then, " came the dry answer. "It might containsomething explosive, you know. "

Though he laughed, young Benson carefully untied the string that heldthe lid on, also carefully removing the latter. Inside he discovereda handsome bouquet of roses, with a card attached. 

"Well, of all the assurance in the world?" gasped Jack Benson. 

"What's the matter!" queried Farnum. 

"Read what's written on this card, sir. "

The inscription ran:

"Mlle. Sara Nadiboff is delighted at learning that Captain Jack Bensonhas returned in safety from his long walk. "

"Any answer, sah?" demanded the darkey in the boat. 

"None, thank you, " replied Captain Jack, in an even tone. 

The boat continued on its way to the shore. 

"Say, what do you think of that?" demanded Eph, after he, too, had takena look at the card tied to the flowers. 

"It is plain enough that our charming young Russian doesn't mean to dropCaptain Benson's acquaintance just yet, if she can help it, " laughedthe shipbuilder. 

"What are you going to do with the flowers, old man?" asked Hal. 

"Flowers should be put in water, to make them keep, shouldn't they"queried the young submarine skipper, innocently. 

"Yep, " nodded Eph Somers. 

"I hope these will keep fresh a long time, then, " murmured Benson. 

Raising the bouquet he dropped it overboard the harbor--on the side ofthe boat away from the hotel. 

CHAPTER XV

CAPTAIN JACK BECOMES SUSPICIOUS

So successful and enjoyable a trip did the naval officers have that, asthe "Benson" was gliding back to the harbor, Lieutenant CommanderKimball broached a subject that had begun to interest the societypeople among the winter visitors to Spruce Beach. 

"Mr. Farnum, " inquired the naval officer, "I have a favor to ask of you. "

"You know in advance, Mr. Kimball, that it is granted. "

"I hope it is, if it's a wise favor to ask, " smiled the naval officer. "In brief, the idea is this: Naturally people in this neighborhood areall agog over this submarine craft. Some of the more daring of theladies have besought me to arrange for a few of them to have a tripon board, even to running beneath the surface. Will you do that, for aparty of our friends, to-morrow afternoon?"

"We've been a good deal beset by spies lately as you have means ofknowing, " replied Mr. Farnum, slowly. "You'll guarantee all of theguests, of course. "

"As a naval officer I wouldn't bring anyone aboard here whom I doubted, "replied the lieutenant commander, flushing. 

"I didn't mean to be offensive, Mr. Kimball. But I have as great areason as Uncle Sam can have for wanting to preserve the secrets ofthis boat from all but sworn officers and men of the Navy. You and Iare one in that desire, Mr. Kimball, so we'll gladly take out any party, ladies included, that you bring on board. "

"Thank you, " answered Kimball. "And I can assure you that I shall bevery careful in making up my party. Oh, but won't there be flutteringhearts at Spruce Beach tonight And I'm more than half afraid that Ishall make an enemy of every lady of my acquaintance whom I have toleave out of the affair. How many, guests can you take, Mr. Farnum?"

"Not above fourteen, all told, " replied the shipbuilder. 

"Then I shall go ashore myself this evening, to deliver my invitations. "

The shipbuilder also went ashore that evening, just to see whether hecould learn anything about M. Lemaire and Mlle. Nadiboff. Almost thefirst person Farnum encountered was reporter Hennessy. 

"Oh, your people are still here, " answered Hennessy, in response to theshipbuilder's question. "They're both keeping in the background, though. It looks as though they feared to run away, and were waitingto see whether the lightning were going to strike them. Now, that I'vetold you so much, Mr. Farnum, can't you give me a little more of theinside of this whole strange business?"

"If I did, " smiled the shipbuilder, "you'd send it to your paper. "

"Of course, " admitted the reporter, honestly. 

"I'll tell you the best I can do, Hennessy. You keep your eyes and earsopen for us, and I'll give you this news story before I give it to anyother newspaper man. "

"You surely will?" demanded the newspaper eagerly. 

"I will. "

"Then I'm here to help you"

As the lieutenant commander had predicted, the ladies at the hotels werein a flutter of excitement that evening. Every one who heard of theprojected trip on the submarine boat, it seemed, wanted to be invited. By the time that Mr. Kimball's list was made up it consisted of threemen and nine women, these in addition to the lieutenant commanderhimself and Mr Featherstone. 

As Jack paced the far end of the veranda that evening a girlish figure, only poorly concealed under a light wrap, stole after him. As theyoung woman reached him she threw back a light veil, revealing the verypretty face of Mlle. Nadiboff. 

"So, my Captain, " she cried, "you would forget me when you are gettingup a party to take a cruise on your wonderful craft?"

If young Benson felt anything as he looked, he was staggered by thisamazing bit of effrontery. 

"You do not answer me, " cried Mlle. Nadiboff. "You feel guilty indeed, then?"

"Perhaps 'astonished' would be the more accurate word, " Jack replied, smiling now. 

"My Captain, you were very pleasant with me, the first evening that wemet. "

"That was before, " nodded Captain Benson, still smiling. He stood capin hand, his whole bearing respectful, for he did not intend to bediscourteous even to this known adventuress. He would grant her atleast the courtesy due her sex. 

"Before what?" she asked. 

"Well, er--before that automobile ride the day. "

"And why should that change your attitude toward me, my Captain?" askedthe young Russian. Her tone was coaxing, almost cooing; her eyesextremely moist, as though the tears would spring forth in anotherinstant. 

"Why, you see, Mademoiselle, " laughed Jack, coolly, "the finish of thatautomobile ride was just a trifle too exciting for me. I have plentyof the strenuous side of life out at sea. When on shore my tastes areall for the quiet, peaceful life. "

"But surely you do not reproach me with having made the automobile rideunpleasant?"

"Only that, as I remember it, you dropped some dust--or something--intomy eyes, and right after that two men took me away in your car--andthen things happened to me. "

"Why, that was all a joke, " protested the handsome young woman, gazingkeenly into his eyes. 

"Then I'll laugh now--ha! ha! But seriously, Mademoiselle, I haven'ta sense of humor that will appreciate carrying a joke quite as far asthat one was carried. "

"It was all a joke, " Mlle Nadiboff insisted. "At least, M. Lemaire soassured me. What ever you may have thought, my Captain, I beg you willnot believe that I had any notion of helping to cause you realdiscomfort. "

Her tone was so sincere in its ring, her eyes looked so honestly andappealingly into the boy's that Jack, for an instant, had to wonderwhether he were dreaming. 

"My Captain, " continued the Russian girl, in a voice that trembledsoftly, "I see, now, that I have been fearfully--cruelly--misunderstoodby you. That is more than I can bear. Come, let us take a little walktogether in the grounds. I want you to tell me just what part youthought I had in some affair against you. I insist; it is my right toknow this. Your arm, my Captain!"

As she spoke, Mlle. Nadiboff slipped her soft little right hand insideof Captain Jack's arm. 

Captain Jack took hold of that hand to disengage it. But Mlle. Nadiboffmerely held the tighter, while the boy was conscious that she wasgazing up at him appealingly. 

"I don't wish to be rude, Mademoiselle; don't, force me to be, " thesubmarine boy urged. "Will you kindly release my arm?"

Then, with a subdued though angry exclamation, the girl obeyed. 

"You will not even hear me?" she cried, stamping one foot lightlyagainst the veranda boards, while now her eyes brimmed with tears. 

"By jove, but she's a bully actor, " thought Benson, with a sort ofadmiration. 

"I am sorry, Mademoiselle, " he replied, "But I am wanted now. I amforced to say 'good evening. '"

With a bow he turned and left her, replacing his cap as he strode away. 

"Oh, that fool, that unnatural young man!" she cried, angrily, toherself. "He prefers what he calls 'duty' to the friendly glance of apretty eye. Bah! Perhaps he is laughing at me at this moment. If heis, he is laughing much too soon, for I shall teach him a lesson or two. You are not yet beyond my reach, my brave young Captain!"

The veil that Mlle. Nadiboff carefully wound so that two folds fellacross her face concealed a hard, sneering, almost barbaric look thathad crept quickly into that handsome young face. 

But Jack joined his own party at once. Through the rest of the eveninghe did not encounter either the young woman or M. Lemaire. The latter, in fact, had made himself practically invisible of late. 

The next afternoon, early, a launch from the gunboat brought off thepleasure party that was to make the trip on the submarine boat. 

Mr. Farnum and David Pollard were ashore at this time. Captain Jack andEph Somers stood on the platform deck to receive and welcome the party. 

The first young woman to whom Benson extended his hand to help heraboard held up a camera for him to take first of all. 

"Thank you, " responded the young skipper, gravely. "We will send thiscamera to the engine room. It will be returned to you at the end ofthe trip. "

As he spoke, he slipped the camera box back to Eph, who started forthe conning tower with it. 

"But I wish to take some photographs with it, " cried the young woman, indignantly. "Especially, a flashlight when we are below the surfaceof the ocean. "

"I am most sorry, madam, " Captain Jack replied, politely, "but it iswholly out of the question for any photographs to be made aboard theboat. "

"No cameras! No photographs?" cried two other young women, in somethinglike consternation. Then one of them added:

"But we want two or three photos as souvenirs--Mr. Kimball, we appealto you. "

"I am wholly powerless in the matter, " replied the lieutenant commander, gravely. "Mr. Benson commands aboard this boat, and enforces the rules. I may add, however, that am wholly in sympathy with his decision. Youwill understand, ladies, that there are many secrets in the handlingof a submarine craft like this, It would be absolutely out of thequestion to allow anyone to carry away photographs of the interior orthe working parts of the 'Benson. '"

With that, two more cameras were passed up. Eph as quickly handed themthrough the conning tower to Hal, who took them down to the engine room. 

Then Jack helped his visitors aboard, while Eph slipped forward to letgo the moorings at the order. 

"Now, ladies and gentlemen, " announced Captain Jack, "I think there willbe room for all on deck. If it pleases you, therefore, I propose thatall remain on the platform deck while we make our run out to sea. Then, when it comes time to dive and run under the surface, we can go below. "

This plan appeared to suit nearly everyone. 

"But I believe I'll go below, now, " proposed one tall, blond, stronglybuilt young woman who looked somewhat Swedish. "I am afraid of too muchchill air on the sea. "

"Then, if it please the rest, we will all go below, " Jack answeredamiably. 

There was instantly a chorus of dissent. The tall, blond young womanhad already made her way to the conning tower, accompanied by a youngman of English appearance. But Eph unconcernedly barred their way. 

"Step aside, if you please, young man, " urged the Englishman. "Thelady wishes to go below. "

"Captain's permission necessary, sir, " replied Somers, quietly. 

"You see, ladies and gentlemen, " Jack explained, "it won't be quitepossible to let visitors roam at will over the boat. It would beagainst my instructions from the owner. Either all must remain on deck, or all must go below. "

As he spoke the young skipper thought he saw a swift look pass betweenthe young Swedish woman and her English escort. 

"Oh, well, " replied the young woman, shrugging her shoulders, "I do notintend to be disagreeable. If the others wish to remain on deck, I willdo so, too. "

"Very good, Miss Peddensen, " murmured the young Englishman. 

Jack Benson took his place at the deck wheel, and Eph, after Hal hadcome to the conning tower opening, hurried forward once more to cast offthe moorings. Then speed was called for, and the "Benson" made agraceful sight as she swept out of the little harbor with such abrilliant, interested company aboard. 

The submarine continued until she was three miles out at sea. 

"Now, if it pleases the company, " Captain Jack called out, "we willgo below and dive. Then you, will know what it feels like to be runningunder the surface. "

From the ladies came a few little gasps of excitement. Some of them, now that the moment had come, almost wished they had remained ashore. 

"No one need be afraid, " smiled Jack. "This boat has been thoroughlytested. We shall go below the surface, true, but we shall come upagain the instant that the proper devices are applied to our machinery. Let no one be afraid. There is not even a particle of danger. "

"Not a particle, " repeated Lieutenant Commander Kimball. "This is aneven safer sport than automobiling. "

"Let the Navy officers go below first, please, " urged Jack, as theladies began to crowd about the conning tower. He wanted this done in, order that both Mr. Kimball and Mr. Featherstone might be able to usetheir eyes on the guests below. 

At last all had passed down the iron staircase save Eph, who remainedby the wheel in the conning tower. 

"Pass directly aft, everybody, please, " called Jack, quietly. 

"What's that for?" asked Miss Peddensen. 

"We cannot allow anyone except naval officers to see how our divingapparatus is worked", replied Jack. "Some of you step into thestaterooms, on either side, please. All of the visitors must be aftof this curtain. "

The extreme after end of the cabin had been rigged with a heavy curtainthat could be dropped into place. 

"Why, I feel as if we were all being penned up here and held for theslaughter, " gasped one American girl, in a tone of fright. 

"Yes, indeed!" protested Miss Peddensen. "This is going too far. "

"It strikes me as being a good deal like an outrage, " blurted theyoung Englishman. "Mr. Kimball, can't you--won't you interfere inthis matter?"

"I am very sorry, " replied the lieutenant commander, "but I cannot. This step is necessary, in order to prevent anyone from having animproper view of the working of the craft. I am going behind thecurtain with you. Mr. Featherstone will remain out in the cabin toaid in the handling of the boat. You need none of you feel anyuneasiness. "

Both Miss Peddensen and the Englishman ceased their objections. ButJack, remembering the glance that had passed between the pair on deck, remained behind the curtain, too, as he dropped it. 

"Go ahead, Hal!" he called. "Fifty feet under the surface. Divegently. "

"O-o-o-oh!" came in little screams of alarm as the guests felt the flooron which they stood inclining at a sloping angle. 

"We're going below the surface now, " young Benson informed them. "We'llsoon be running on an even keel. "

"All below, " called Hal Hastings in a few moments. 

"And all clear?" asked Jack. 

"All clear, Captain. "

"Jack Benson threw aside the heavy curtain, come forward, slowly ladiesand gentlemen, and take seats, " was Jack's invitation. "I am sorry Ishall have to ask you all to remain seated, but we cannot have anyserious shifting of weight while we are running under the water. "

Though Eph was at the tower wheel Hal Hastings was now virtually incommand of the boat, by previous arrangement, for young Benson meant tokeep a sharp, though covert, eye on passengers. 

The young skipper noted, swiftly, that Miss Peddensen had taken the seatfurthest aft in the cabin, while the young Englishman was seated at theforward end of the party of guests. 

"Oh, I say, Captain Benson, " called the Englishman, "are you permittedto show me how you know just how far below the surface you are?"

"The gauge tells that, " replied Jack. "But I will ask you to excuseme from describing it, as I wish to keep my mind on the running of theboat. Mr. Hastings will oblige you; or, I don't doubt, one of thenaval officers will. "

Even this momentary distraction, however, had given Miss Peddensen timeto slip something out of one of her wide sleeves into her lap. And nowthe young Swedish woman sat so that the object taken from her sleeve wasconcealed behind the woman who sat next to her. 

It wasn't many moments ere Jack noted some thing about the young Swedishwoman that caused the young skipper to turn, every now and then, for aswift though hidden glance in her direction. 

"What on earth is Miss Peddensen doing?" wondered the submarine boy. "Hang it, I believe she's up to something that she ought not to bedoing!"

Through he did not turn and walk in her direction, Jack, thereafter, kept the young Swedish woman much more under secret observation. 

"By Jove, I know what she's doing, now, " muttered the young skipper. "That movement of her elbow betrays her, and her eyes are fixed, much ofthe time on her lap. If she isn't sketching something, on the sly, thenmy eyesight isn't as good as it used to be!"

Captain Jack Benson found himself quickly aquiver with suspicion andindignation. 

"Yet I can't afford to make any mistakes, " he told himself, uneasily. "I've got to be absolutely sure before I can take the risk of startinga human cyclone about my ears!"

CHAPTER XVI

THE GOVERNMENT TAKES A HAND

Yet, for a brief interval more, Jack Benson hesitated. 

"Is the young woman sketching, or is she merely writing?" he wondered, anxiously. He watched her a little while longer. 

"No; she's sketching. Those are drawing strokes she's making. "

Then, looking wholly blank, Jack Benson turned on his heel. He lookedfirst at one mechanism, then at another. Yet, presently, stood closeto Lieutenant Commander Kimball's ear. 

Only a few words were said, but the naval officer understood instantly. 

As Captain Jack turned and went back, Kimball also sauntered along, although he did not appear interested in the submarine boy's movements. Yet it was not long when both appeared before the young Swedish woman. 

"Miss Peddensen, " murmured the lieutenant commander, "may I see whatyou are writing?"

The woman looked up, her face composed, her eyes dancing with mirth. 

"Why, surely, Mr. Kimball, " she replied, laughing. "And very silly stuffyou'll find it, too. I have been jotting down my impressions uponfinding myself riding under the surface of the sea. I do not handleyour English language very well, as you will see. "

Mr. Kimball glanced hastily through the three or four pages of ratherclosely written note paper. It was, as the young woman had stated, a very amateurish composition, in very stilted English. 

The naval officer felt a sense of mortification and his face reddenedslightly. He had been led to expect that he would find something crimeon these sheets of paper. Instead, he scanned a stupid piece ofcomposition. 

"I would die of humiliation, to have that read before all these people, "murmured the young woman. 

Lieutenant Commander Kimball gave Jack Benson a covert elbow-dig in theribs, a move said, as plainly as words:

"The joke is on you. "

Jack, however, through half open eyes, had been watching on his ownaccount. Suddenly he made a dive forward, shooting his hands down closeto Miss Peddensen's well-booted feet. 

"That same old ship-rat!" exclaimed the submarine boy. "I'll catch thebeast before he goes under your skirts, Miss Peddensen. "

At the mention of a rat so dangerously close young woman almost shot outof her seat in anxiety to get away. 

As she bounded something dropped down out of the wide right sleeve ofher coat. It was a small memorandum book. 

This was just what Jack Benson caught, in place of the pretended rat. Moreover, the young skipper was clever enough to catch the book so thatit fell into his hands open. 

"It wasn't a rat, after all, Miss Peddensen, " smiled Jack, straighteningup and holding the open memorandum book so that both he and Kimballcould see what was traced on the two pages that lay exposed. 

There were sketches of the compressors, sketches of the mechanism bywhich the compressed air was forced into the tanks to drive the waterout--in fact, sketches of many vital features in the control of theboat. Nor was more than a glance needed to make it plain that thisyoung woman artist possessed expert knowledge of machinery. 

At the cry of "rat" three or four women jumped from their seats. Theone nearest Miss Peddensen moved hastily to the forward end of the cabin. 

"My dear young woman, " murmured the lieutenant commander, dropping intothe vacated seat beside the Swedish girl, "you won't mind, will you, if I keep these little matters to look over at my convenience!"

There was something so compelling in the look that flashed briefly inthe naval officer's eyes that Miss Peddensen lost color, and stammered:

"No-o-o, certainly not; if such silly things interest you. "

"They interest me very much indeed, " murmured Kimball, thrusting"composition" and sketches inside his blouse. 

As the naval officer plainly intended to remain where he was, Jack Bensonturned, sauntering forward. 

"Another spy nailed, beyond a single doubt, " muttered the young submarinecommander. "Will there never be an end to them. "

As Captain Jack glanced at the young Englishman, Drummond by name, he sawan unmistakable flash of hostility in the Englishman's eyes. 

"So you're a spy, too?" quivered Benson, inwardly, turning on his heel. After that, howsoever, the submarine boy took good care to keep Drummondunder covert watch. 

In time the "Benson" returned to the surface, being now much nearer landthen when the aft had made its dive. A few minutes later the boat raninto the harbor and made fast at its moorings. 

"What are you going to do about the young woman?" Jack found a chanceto whisper, as all hands gathered on the platform deck. 

"I don't believe I have actual authority to do anything, " Kimballreturned, also in a whisper. "But we have the drawings, and thatwriting, which may be a clever cipher. With that I'm afraid we'll haveto remain content. "

A launch from the gunboat was in waiting. In this the shore guests weretaken back to land. Hardly had the launch left the side of thesubmarine, when a cutter, also from the gunboat, put in alongside. Twomen in ordinary citizen's dress clambered aboard. 

"Lieutenant Commander Kimball?" inquired one of the pair. 

"Yes, " acknowledged the naval officer. "May we see you below, in thecabin of this boat. "

"No!" replied Kimball, sternly. 

"Oh, as you please, of course, " smiled the one of the pair who had firstspoken. "Probably I am at fault, though, in not introducing mycompanion and myself. My friend is Mr. Packwood; my name is Trotter. We are Secret Service men sent down here by the Secretary of the Navy, in answer to your dispatch. "

As Trotter spoke he threw back the lapel of his coat, displaying a badge. 

"I have also some papers to show you, Mr. Kimball, " continued theSecret Service man. 

"Oh, of course you may come below, " smiled the naval officer. "And, Benson; I guess this business belongs to you, too. "

So Jack descended with the party, while the other submarine boys andWilliamson remained on deck. 

"You have, been bothered with spies, Captain?" asked Trotter, turningto young Benson, when they had reached the cabin table. 

"Haven't we, though!" muttered Jack. 

"And even took one out with you on this last trip of yours, " laughed Mr. Trotter, producing from an inner pocket a book bound in black. 

"Miss Peddensen, the Swedish young woman?" demanded Captain Jack. 

"Here's the one I mean, " replied Trotter, opening the book, which provedto be an album, and turning the pages over rapidly. He pointed to aphotograph. 

"That's Miss Peddensen, " cried Jack, looking up at Lieutenant CommanderKimball for confirmation. 

"Well, Peddensen is one of the names she has used, " smiled Trotter. 

"What foreign government does she serve?" demanded Benson. 

Trotter shrugged his shoulders. 

"Well, the Department has pretty good information that she has servedEngland, France, Germany, Austria, Russia--oh, these spies have nocountry! They serve the fattest international purse!"

"Here is what we took from Miss Peddensen, " said Kimball, gravely, layingdown on the table the sketchbook and the "composition. "

Taking up the latter, Mr. Trotter, after a glance declared:

"This is written in a secret cipher, most likely. Packwood, this comesin your peculiar line of work. The sketches are easy enough tounderstand. They are of the mechanisms displayed in this cabin. "

"Yes, this is a cipher, " declared Packwood, thoughtfully, after scanningthe sheets a few moments. "With some study I can make it out. "

"Who's the young Englishman who escorted Miss Peddensen?" demandedCaptain Jack. 

"Never saw him until I glanced at him in the launch just now, " repliedTrotter. "He may be another spy, unknown to us, or he may be merely agood-natured and wholly innocent young chap whom the Swedish girl haslured into her service. "

"What are these other pictures?" inquired Mr. Kimball, beginning toturn the leaves. 

"All of 'em photos of people known to be engaged in stealing navalsecrets for foreign powers, " replied Trotter. "Captain Benson maykeep this album for future use. I've another copy for you, Mr. Kimball. "

"Why, here's a good likeness of Mlle. Nadiboff, " cried Jack Benson, pausing in turning the leaves and glancing down at the picture of a facehe had good cause to remember. "And here, opposite her, is M. Lemaire!"

"Oh, yes; they're both old offenders, " nodded Trotter. "Turn along, andsee if you remember any more faces. "

"Here's Gaston, who is now in jail here, " nodded Jack. 

"Is he, though?" asked Trotter, with interest. 

"What charge?"

"Felonious assault upon Hastings and myself. "

"Good, " chuckled Trotter. "I shall have to see the judge privately, andask him to make sure that Gaston Goubet gets the longest sentencepossible. Nothing like prison bars to stop the work of theseinternational spies!"

"Why, here's even little Kamanako, " smiled as he turned over anotherpage. 

"Yes, and a very smooth and slippery little spy that Jap is, " declaredMr. Trotter. "He steals all kinds of secrets, from the details ofsixteen inch guns down to the method of dyeing a blanket in a mill. "

"Are you going to do anything with the Peddensen woman?" inquiredLieutenant Commander Kimball. 

"Ain't I, though--just!" answered Mr. Trotter. "You caught herred-handed, with drawings, cipher and all. "

"Will she be imprisoned?" inquired Captain Jack. 

"Well, that isn't the usual way, " replied Trotter. "The young woman ismore likely to be taken to New York, given a passage ticket across theocean, and notified that, if she tries to return to this country, shewill find that her photograph is on file at every port of entry. Itwill spoil her games, without making much of a fuss. "

The cutter waiting alongside conveyed Kimball and his brother officer, Featherstone, back to the gunboat. Then it ran into shore; putting Mr. Trotter and his silent companion once more on land. 

For some minutes after that Jack, Hal and Eph remained absorbed in thepictures in this album of known naval spies. There were more than twodozen of these photographs, some of men, some of women. On the samepage with each picture was given the subject's true name, if known, also the spy's aliases, and other information. 

"Sara Nadiboff, twenty-nine, yet looks like twenty, " muttered Hal, studying the information under the young Russian woman's photograph. 

"And Kamanako is really Lieutenant Osuri, " muttered Jack. "Yet thefellow was working in the hotel kitchen until he could get a chanceto apply for a job on this craft. "

"I don't recognize any other spies among these pictures, " mutteredHal. "The only ones here that we know we had already guessed. "

"Look at that time, " muttered Jack, jumping up. "I must get on shoreand see what Mr. Farnum's orders are. And--" thrusting the albumin his coat pocket and buttoning it up, "I'll take this picture galleryalong. Our employer will be highly interested in it. "

It was dusk by the time that Benson reached the platform deck. Aftera few moments he succeeded in hailing a harbor boat. Yet it was quitedark by the time that Captain Jack stepped on shore. 

Instead of going around by the road Jack decided to cross the grounds. As he was walking briskly toward the hotel, an athletic-looking youngman stepped out suddenly, from behind of the big trees, blocking thesubmarine boy's path. 

"Good evening, Mr. Drummond, " Jack hailed, quietly. 

"Now, you halt and stand right where you are, " retorted the Englishman, nervously handling a heavy walking stick that he carried. "I don't knowwhether it's going to be a good evening for you, or not, young man. Doyou know that your cursed meddling has resulted in the arrest of a mostestimable young woman?"

"Who?" asked Jack, coolly. 

"Miss Peddensen, " replied Drummond, angrily. 

"Oh, I guess the secret service men know what they're about, " said Jacksomewhat sarcastically. 

"And I know what I'm about, too!" roared the enraged Drummond, raisinghis cane, wrathfully. "Benson, you young sneak, I'm going to brain you!"

CHAPTER XVII

DRUMMOND'S LITTLE SURPRISE--FOR HIMSELF

It didn't happen just that way. 

As Drummond swung his cane and brought it down with crushing force, aimedat the submarine boy's head, Jack wasn't there. 

Instead, Benson sprang about two feet to one, side. It would have beena fearful blow had Jack's head been in the way. As it was, the canehit the ground with such force as to be thrown from the Englishman'shand. 

With a growl, the fellow leaped forward and snatched up his stick. JackBenson stood leaning carelessly against a tree, in a way that enragedDrummond all the more. 

"I'll show you!" snarled the Englishman. With that he aimed a blow, sideways, at Benson's head Jack ducked, then dodged out. The cane hitthe tree with a force that jarred the assailant and all but dislocatedhis wrist. Again he dropped the stick. 

Benson gave a hearty ringing laugh and this enraged the Englishman pastendurance. Then Jack added, "Is that the best you can do?"

"I'll show you!" roared the other, making a leap forward. He chargedstraight at the submarine boy, who wheeled and darted on toward hotel. 

"Don't run, you coward!" came the flying taunt. 

Just then Jack Benson fell, though he did it on purpose. Straight inthe path of the irate Englishman the submarine boy dropped, curlinghimself up. 

It was too late for Drummond to halt, or to change his course. Hetripped over prostrate young Benson, then lurched forward landing onhis face. 

Up sprang Jak Benson, planting two sterling good kicks. 

"You beast! Wait until I get up!" roared the victim, in a voice likea bull's bellow. 

"What's the matter here?" demanded an astonished voice, and Mr. Trotter, after a short dash, bounded through the darkness, arriving on the scenejust as Drummond was getting up. 

"This fellow--" began Jack. 

"'Fellow'?" broke in Drummond, angrily. 

"This fellow, " Jack continued, calmly, "accused me of causing MissPeddensen's arrest, and promised to brain me. "

"Too bad you've allied yourself with that young woman, " muttered Mr. Trotter looking keenly into the Englishman's face. 

"What d'ye mean?" demanded Drummond. 

"Miss Peddensen turns out to be a well-known military and naval spy, though she hasn't operated in this country before in five years, "replied Mr. Trotter, coolly. "However, she has been caught trying tosteal the secrets of the submarine boat, and she's under arrest. Myside partner, Packwood, is now engaged in unraveling a cipher that wastaken from her. "

"That's an impudent lie, " asserted the Englishman, hotly. 

"No it isn't, " laughed Mr. Trotter. "It's a Secret Service fact. "

"I'm going to go to Miss Peddensen, now, then, " asserted Drummond. 

"Right-o, " drawled Trotter, so significantly that Drummond shot a quicklook at the officer, demanding:

"What d'ye mean by that?"

"I'm going to take you to Miss Peddensen, " returned the Secret Serviceman. 

"I'll go all the way to Washington, by tonight's express, to see theyoung lady freed from this outrageous mistake, " stormed the Englishman. 

"I don't know about your going to Washington--to-night, " repliedTrotter, yawning. 

"What have you to do with that?" demanded Drummond, harshly. 

"Why, I reckon, Mr. Drummond, you're my prisoner. You won't very easilygo anywhere to-night, without my consent. "

"Your prisoner?" demanded the Englishman angrily. 

"Yes. "

"By what right do you arrest me! What have I done?"

"Well, for one thing, you've tried to injure the captain of the submarineboat, all because he caught your woman friend at strange tricks on boardthe 'Benson. ' For another reason, because we suspect anyone who defendsor upholds the spy. Be good enough to step along with me, Mr. Drummond. "

"I'll do nothing of the sort, " blurted the astounded Englishman

"You'll go all the same, " warned Mr. Trotter, first of all displayinghis Secret Service badge, next running a hand back briefly to a revolverthat rested in a hip pocket. "I don't much care, Drummond, whether youwalk with me, or whether I have to send for an ambulance to bring youalong. But you'll go just where I want you to. "

The Englishman was too much terrified to reply. Two or three times heopened his mouth as though to speak, but, instead, merely swallowed. 

"Come, now--forward march" advised Mr. Trotter. Drummond, withoutallowing himself to hesitate, went away at the side of the SecretService man. 

"Don't you want your cane?" called Jack Benson. Drummond did notcondescend to answer, so the submarine boy slipped back to the tree, where he found the stick. It was a handsome piece of polished partridgewood, surmounted by a handsomely wrought head of gold. 

"This will make an interesting souvenir to keep aboard the boat, " musedBenson, swinging the stick as he continued his walk. 

At the veranda Jack came face to face with Mlle. Nadiboff, just returningfrom an unaccompanied stroll down by the water front. To the submarineboy's astonishment the handsome Russian greeted him most amiably. 

"You have not forgotten old friends, I hope, my Captain?" she added, smiling and with a pretty little coaxing way. 

"There are some old friends, " replied Captain Jack, lifting his cap, "whom it is impossible to forget. "

"I hope you will continue to regard me as a friend, " responded Mlle. Nadiboff, more seriously, looking him fully in the eyes. 

"Why?" queried Jack. 

"I may need a friend, " she replied, dropping her glance for a moment. 

"You in need of anything--even a friend?" cried Captain Jack, incredulously. 

"I may need a friend who can speak a good word for me; who can forgetthings, or explain them. " went on Mlle. Nadiboff, resting a handpleadingly on his sleeve "My Captain, if need be, I shall send for you. Do not fail me! You won't?"

It looked as though the tears lay just behind her eyes. The submarineboy felt that the situation was becoming too interesting, so he liftedhis cap once more as he turned on his heel. 

"Mlle. Nadiboff, " he sent back to her, "I trust you will never want forthe most reliable friends. "

He turned down the veranda to go toward the office door, when heencountered another surprise. 

Leaning against one of the posts stood Kamanako, as natty and trim asthough he had come from the tailor's. 

Looking up with a most friendly smile, the little Japanese saluted. 

"Why, how do you do?" Jack greeted him, halting. "I had an idea youhad left Spruce Beach. "

"I should have done so, but I started too late, " replied Kamanako, still smiling. Nothing ever daunts that Japanese smile. One of theselittle men, being led away to have his head chopped off, goes witha smile on his little brown face. 

"Started too late?" asked Jack. "How was that?"

"Now, you laugh at me, " replied the Japanese. 

"Laughing at you? Not a bit!"

"You have told some one that I am a spy, " replied Kamanako, withouta trace of grudge in his voice. "So now, I cannot leave Spruce Beach. Ticket agent, he will not sell me. If I try to go on foot, the roadsare watched. If I take to woods, even, I shall be found. "

"Sorry, " nodded Jack Benson, and passed on. "So the Secret Service netis around the place, and no suspected person can get away?" mutteredthe submarine boy. "Well, that's it should be. I wonder if thereare any more of this strange crew--men or women spies that don'thappen to have suspected so far? If there are, I don't believe they'llwriggle through the meshes of old Uncle Sam's Secret Service net, anyway. "

His mind full of the doings of the day, Captain Jack Benson found Messrs. Farnum and to whom he surely had much to tell. 

CHAPTER XVIII

"REMEMBER WHAT HAPPENED TO THE 'MAINE'!"

"We'll have no more trouble, I imagine, " nodded Jacob Farnum, with asatisfied air, when Jack, at a table in the corner of the dining room, had told, in low tones, all that had happened. 

"The spies are all on the defensive, now, beyond a doubt, " added DavidPollard. "They'll be too busy keeping their wrists out of handcuffs todevote any of their time to trying to get at the secrets of the 'Benson. '"

"I hope you're both right, " said Captain Jack, gravely. 

"Why, what leads you to think that we may not be?" asked Farnum, curiously. 

"Nothing in the way of facts, " Jack admitted. "Yet there may be othersof this infernal spy gang who have not yet shown their hands, of whoseexistence the Secret Service knows nothing. "

"Well, what can they do, if you don't allow any strangers on board theboat?" asked Mr. Farnum, point blank. 

"Nothing much, " muttered Benson, "unless--"

"Well, unless what?"

"See here, " asked the submarine boy, "what is usually done to such spiesby the United States Government?"

"Why, the law provides that, in war time, such spies can be shot inmighty quick order, " replied Mr. Farnum. "In peace times the law doesn'tallow anything but sending spies to prison. "

"But what does the Government usually do?" pursued Captain Jack. "Itseems to me I've read of suspected spies being caught around Americanfortifications, trying to make notes, or take photographs. "

"Yes, " nodded the shipbuilder. 

"And I think I've read, also, that such spies are generally warned andthen let go. "

"That's the usual procedure, I believe, " admitted Farnum. 

"Then, after the spies who have been bothering us have all been roundedup and scolded, they'll be given railroad tickets and allowed go ontheir way?" asked Jack. 

"Frankly, I'm afraid that's just what will be in the present case, "admitted Jacob Farnum. 

"Then, " grumbled Captain Jack, making a rather wry face, "it would seemthat being a foreign spy, in this country, provides one with a callingthat is a good deal safer than being just a lightning rod peddler or abill collector. "

"Yes; it's really so, " admitted the shipbuilder, thoughtfully. 

"If that is the case, " muttered Captain Jack, "the spies here at SpruceBeach will probably keep a bit quiet until they see how things are goingto turn out. As soon as their minds are made easy by our generousgovernment, then they'll plot their next moves. If they can't accomplishanything more, they may content themselves with a general revenge ofsome sort on the whole lot of us. "

"You're not afraid of their vengeance, are you?" asked Mr. Farnum, looking up, and into the eyes of his young captain. 

"I'm not afraid, of anything, sir, " retorted Jack. "The master of asubmarine boat has no right to be afraid of things. Even if thesescoundrels should get me, in the end, all I can to is to smile, andsay: 'So be it. '"

Then, in the next breath, Benson added, earnestly:

"It doesn't matter so much if these rascals get me, but I don't want themto work any mischief to the submarine. "

"Bravo!" nodded David Pollard, looking on with a smile. 

It is a fact that life in a constant atmosphere of danger renders theaverage man all but indifferent to fear. Those who meet perils dailygrow to consider danger as all a part of the day's work. Perils which, a year before, would have kept Jack Benson awake with dread for a weeknow appeared to him as not worth thinking about until they happened. 

Jack remained ashore until half-past nine. He hoped to hear some wordof what the Secret Service men might have learned, or of what theserepresentatives of Uncle Sam were doing. But no word came, so thesubmarine boy went down to the beach. There was but one harbor boatin sight. 

"Ah done thought yo'd be gwine back to do little ship, sah, so Ahdone waited fo' you', " explained the negro in the boat. "Any mo'ob yo' pahty to go abo'd to-night, sah?"

"No, " Jack answered. "I'll be the last one to put off to-night. "

Nor did he forget to reward the darkey's enterprise by handing himrather more than the usual boat hire. 

As he stepped aboard Jack found Hal pacing the platform deck. 

"Keeping deck watch, old fellow? I'm glad see that, " Captain Jacksaid, commendingly. 

"Yes; I'm on until midnight. Then Williamson stands watch untilthree-thirty in the morning. After that Eph comes up and takes thetrick until it's time to call us all. "

"When do I come on watch?" asked Jack. 

"I never heard the captain of a craft had to stand watch in port, "laughed Hal Hastings "Besides, old fellow, we couldn't be sure you'dbe aboard to-night. So the watches are all arranged. Anyway, you'dbetter turn in and get a full night's sleep, for you've more on yourmind than the rest of us. "

"Then tell Williamson, and have him pass the word on to Eph, that watchought to be very strictly kept, " answered the young captain. 

A few minutes Benson remained on deck, chatting with his chum. When heat last went below the submarine captain lost little time getting intohis berth. 

When Machinist Williamson came on deck at midnight a light wind wasblowing, but the air was not really chilly. In his heavy reefer themachinist felt wholly comfortable after he had lighted his pipe andstarted his slow walk back and forth along the deck. 

There did not appear to be overmuch sense in keeping this deck watch. Only a short distance away lay the United States gunboat "Waverly, "with her alert marine guard. Though there was no moon, the starlightwas bright enough to enable a marine on the gunboat to see anything thatmight skim over the water toward the "Benson. "

Yet Williamson was on watch, under instructions, and he was a faithfulfellow who meant to do his full duty. 

"Seems kinder tough, of course, to be so long out of one's bunk in themiddle of the night, " the machinist admitted to himself. 

Yet, had his vision been keen enough to know what was happening on shore, almost directly opposite the "Benson, " Williamson would have beentenfold more alert. 

Over there on the shore, in a clump of flowering, semi-tropical bushes, crouched two men. On the ground with them lay a metal cylinder some twofeet long and seven inches in diameter. There was also a coil of wireand a boxed magneto battery. 

One of the pair held to his eyes a pair of night marine glasses. Incessantly this watcher kept his gaze focused on Williamson. 

About two o'clock in the morning Williamson found it necessary to gobelow for a few moments. After reaching the conning tower he paused, for a few moments, to look keenly all about him. 

Yet, look as he would through the night, the machinist's vision couldnot see that the bush hidden pair on shore, guessing his intentionfrom his stop by the conning tower, had silently taken to the water. With them they towed the metal cylinder, which floated. To the cylinderwas attached one end of the light wire. 

Some distance out from the shore the pair halted, treading water, onlytheir eyes above the surface. But Williamson could not make out suchsmall objects at the distance. Then he went below. 

"Now, for it, " breathed one of the swimming pair, tensely. 

Both swimmers struck out strongly, yet silently, making fast progressthrough the water by means of some of the best strokes known to swimmers. 

When they reached the port side of the submarine Williamson was stillbelow. Nor had the attention of the marine guard on the "Waverly"been attracted. 

In just another swift instant the swimmers made a dive that carried themand their cylinder below the surface. 

Straight up against the bottom of the hull the pair went. 

When they returned to the surface the metal cylinder was in place below. 

Glancing backward only once, to make sure that Williamson was not yeton deck, and that the gunboat's marine guard had not detected theirstealthy work, the swimming pair struck out lustily for shore. 

Back into the same clump of bushes they made their way. In the firstfew moments neither of the recent swimmers appeared to dare a glanceinto the face of his comrade. In silence they fitted the shore end ofthe wire to the battery. 

Then one of the pair seized the handle to pomp the fatal electric sparkalong the wire to the hidden mine under the "Benson's" hull. 

"Remember what happened to the 'Maine'!" this wretch chuckled hideously. 

CHAPTER XIX

A JOKE ON THE SECRET SERVICE!

"What's that noise?" wondered Williamson. 

He stopped, listening intently, for he was still below. 

Against the bottom of the "Benson's" hull he heard a steady, slow, monotonous bumping. As he listened, his face took on an anxious look. 

"We're in a friendly port, " muttered the machinist. "It can't beanything very wrong, and yet--"

That slow steady bumping continued. 

"Anything bumping against the bull of a boat at anchor, in that fashionmay be wrong, " concluded the man, swiftly. 

His mind made up to this much, the rest was not difficult to decide. Thecause of that bumping required instant investigation. Williamson caughtup the tool that came quickest to hand, a pair of nippers, thrust theminto his jumper and raced up to the deck. 

"If it's any real mischief, " he muttered, "I hope I won't be tooslow--too late!"

With that he dived overboard, at the starboard rail, the side nearestthe gunboat. There was a splash--then the waters closed over themachinist. 

He came up at about the point he had planned, where he had heard thebumping. 

Held below water as he was by the under-hull of the submarine, he couldmove with certainty, though but slowly. 

Groping, the machinist encountered the metal cylinder. Quickly he feltfor its connections which, like a flash, he knew must exist. He foundthe wire, but reached for another. It all had to be done swiftly, forhis reserve "wind" was fast giving out. Not finding a second wire, hefastened his nippers against the first wire--then cut. Now, steeringthe metal cylinder, he pushed it out from under the hull. Cylinder andman rose together. 

Whew! What a powerful breath the man took! Then he steered the cylindercarefully against the hull, and managed to hold it there until he couldreach a piece of cordage and make the cylinder fast. 

This done, he dashed below, thumping hard on the door of the stateroomoccupied by Captain Jack Benson and Hal Hastings. 

"Eh? What is it?" called Jack, almost instantly. 

"You're wanted on deck, Captain--instantly, " replied the drippingmachinist. 

"Oh, all right, Williamson, " and Benson's feet hit the stateroom floor. 

A minute later he was above, Hal following only some twenty secondsbehind his young chief. 

Williamson swiftly told how he had heard the bumping against the hull, and how he had found the cylinder, with a wire connection. 

"Gunboat, ahoy!" roared Captain Jack, snatching up a megaphone andholding it to his lips. 

The response was prompt. In less than three minutes a cutter, containingan officer, a corporal and four marines, was alongside. 

"The first thing for us to do is to take that cylinder aboard the'Waverly' and investigate it, " decided Ensign Foss. "I'll leave themarines here until I get further instructions from the commandingofficer. "

"Anything happening?" demanded Eph, reaching deck just after the cutterhad put off. He eyed the marine squad curiously. 

"Just what we're trying to find out, " replied Jack. 

"It must seem to you that I acted amiss in leaving the deck, " put inWilliamson. 

"But you didn't, " retorted Jack. "Had you been on deck you wouldn'thave heard that infernal machine bumping against the hull. "

"Infernal?" echoed Eph Somers, rubbing his eyes. "Say, have I beenmissing a whole lot by being asleep?"

The other three told him quickly all they knew of what had happened. 

Within five minutes the cutter came back, bringing two more marinesand a young second lieutenant of that corps. 

"Lieutenant Commander Kimball's compliments, sir, " reported the secondlieutenant. "He will put in an appearance as soon as that cylinder hasbeen investigated. He has sent me with instructions to see what had bestbe done. "

"I don't believe there's much doubt as to what had best be done, "replied Captain Jack, quickly. "Williamson reports having cut a wirethat was attached to that cylinder. I think we can find that wire again, and, if we do, we can easily follow it to its other end. "

"By jove, that's good enough, " muttered the lieutenant. 

"Williamson is already wet, " proposed Jack. "He can dive again, and seewhether he can pick up that wire. If he needs any help, I'll gooverboard with him. "

"Wait until I see what I can do, " proposed the machinist. 

This time he dived over the port side of the craft. Three or four timeshe came up for air, next going, below again. At last, however, Williamson came up, calling:

"I have a part of the wire in my hands. "

Lieutenant Foster ordered his marines into the cutter, inviting Jackand Hal also to go with him. They rowed out alongside of Williamson, picking up the machinist and his wire. 

"We'd better put your man back on the boat, hadn't we, Mr. Benson?"inquired the marine lieutenant. 

"I'm not such weak stuff as that, sir, " almost grumbled the machinist. "I can stand a few minutes more in wet clothes, and I want to go along tosee where this wire leads. "

"Good enough, " nodded Lieutenant Foster, he gave the order to row alongslowly, while two marines in the bow of the cutter slowly gatheredin the wire, at the same time signaling back the direction in which itlay. 

Only a few minutes were needed thus to follow the trail straight to theclump of bushes on shore. 

"Nobody leave the boat until we have a lantern ready, " directedLieutenant Foster. "We don't want to tramp out the trail of the rascalswho laid that mine. "

The marine lieutenant himself was the first to step ashore, and JackBenson was with him. 

"Here are the footprints of the rascals, " announced Foster, as the twostepped cautiously into the bushes. 

"Yes; there were just two of them here, apparently, " replied Jack, afterstudying the prints, and discovering the marks of only two differentsizes or kinds of shoes. 

"Here's the imprint of a box, " added Foster. "Good heavens, thescoundrels had a regular magneto battery, insulated wire and all, forfiring that mine from the shore. Mr. Benson, they meant to blow yourboat into Kingdom Come!"

"It looks that way, " replied Jack Benson, composedly. 

On hearing that voice, so even and unaffected in its utterance, Lieutenant Foster looked at the submarine boy keenly. 

"By Jove, Benson, you're cool enough to be an admiral, " muttered themarine officer, admiringly. 

"Why, this doesn't seem to be a joke on me, " replied Captain, Jack, smiling back at the lieutenant. 

"A joke!"

"It's one on the Secret Service, " laughed Jack, quietly. "They are theones who are supposed to have the job of keeping off spies and all oftheir kind. "

"Yes; this certainly came from the spies, or their friends, " mutteredLieutenant Foster. "Jove, but we have a desperate crowd to deal withwhen they'll go to such a length as this in time of peace!"

"Oh, it may all turn out to be a joke, " put Hal, quietly. "Some onemay have been doing this to try us out. That metal cylinder may proveto have been loaded with ginger-bread or peanuts. If anyone has beentrying a joke on us, then I'm mighty glad we didn't get rattled. "

"I reckon we shall soon know just what that cylinder did contain, "muttered Lieutenant Foster. "Here's another cutter coming from the'Waverly, ' and I think I make out Lieutenant Commander Kimball in thestern-sheets. "

It was, indeed, the lieutenant commander. As he stepped ashore, hisface coming into the circle of light cast by the lantern, his featureswere seen to be white with anxiety. 

"We have just looked into the cylinder, " he announced, in a low voice. "We found there enough gun-cotton to blow the 'Benson' into inch pieces. It was a fearful crime to plan. "

Jack Benson and Hal Hastings heard, but did not change color. There wasno sense in losing nerve over a disaster that had been averted in time. 

"The first thing to do, of course, " continued Lieutenant CommanderKimball, "is to send instant word to Messrs. Trotter and Packwood. They have a heap of work ahead of them. "

"As to our own boat's crew, " replied Jack, "I fancy the best thing wecan do is to go back on board, since we can't do anything here. One ofus will keep watch, and the rest of us can get some of a night's sleepyet. "

"Why, yes, if you youngsters can sleep, after such happenings, " laughedKimball. 

By this time Lieutenant Foster and two of his marines had followed thetrail of footprints as far as the hard road. Here all trace was lost. 

"What you want to do, Williamson, " declared Jack, as soon as thesubmarine people were back on their own craft, "is to get into somedry clothes and make yourself a pot of hot coffee. Then get in betweenblankets for a sleep. I'll finish out your watch. "

Nor was Benson alone in his watch, for a cutter from the gunboat, containing a corporal and two marines, beside sailors to row the boat, moved slowly around the submarine at a distance of fifteen or twentyyards. 

After the rest had gone below, Captain Jack, hanging over the rail ofthe platform deck, saw other lanterns gleaming in and around the clumpof bushes. 

"That must be the Secret Service people, pulled out of their comfortablebeds, " mused Benson, smiling. "Won't they feel upset at any suchthing happening hours after they've arrived on the spot?"

After Eph Somers had reported on deck to take his watch, Jack wentbelow, once more dropping into sound slumber. The smell of coffee andbacon was wafted in from the galley when the young submarine captainnext awoke. 

"Well, " announced Eph, as Jack and Hal came forward for their breakfast, "Trotter and Packwood haven't caught the fellows that laid the mine. "

"It doesn't look strongly probable that they'll catch them, either, "Jack replied. "I don't believe that the fellows who did that trick areany of the regular spies. For that matter, we now of only three spieshere who are men. Drummond is under arrest, and so is Gaston. Neitherof them could have had a hand in it. And there were two, so, if M. Lemaire was in it, he had an unknown accomplice. But I don't believeM. Lemaire had any personal hand in laying that mine. I've a notionthat he considers himself entirely too high class to go into any mereblasting operations. "

"'Mere blasting operations' is good, " smiled Hal Hastings, "when westop to think what those 'blasting operations' might have done for usif it hadn't been for Williamson. "

"Anyone taking my name in vain?" demanded the machinist, smiling as heput in an appearance at that moment. 

"We're trying to see, " Eph explained, "whether we can do any betterguessing than the Secret Service men as to the fellows who were kindenough to lay that mine under us last night. "

"Got it figured out?" asked the machinist, as he transferred, a generoushelping of bacon, eggs and fried potatoes, to his plate. 

"For myself, " put in Hal, "I'd suspect that fellow Gaston, in an instant, if he had only been at liberty. That fellow has an eye that looks likeall the letters in the word 'r-e-v-e-n-g-e. '"

"That's so, " nodded Jack, thoughtfully, as he ate. "But we happen toknow that Gaston is very safe under lock and key. By the way, fellows, I don't suppose Mr. Farnum and Mr. Pollard have heard the news yet, orthey'd be out here on the double quick. "

After breakfast Jack went ashore alone, to carry the exciting news tohis employers. He found Messrs. Farnum and Pollard in the breakfastroom at the Clayton. Both were astounded when they heard the news ofthe night's doings. 

"Who on earth could have put up such a job against the submarine?"gasped David Pollard. 

"I don't know, sir, " Captain Jack replied. "But I've left Hal onboard, in command, and I mean to find out something about this business, if there is any way to do it. "

With that he excused himself, rising and leaving the table at which hisemployers were seated. 

Jacob Farnum gazed after his young submarine captain, then whispered tothe inventor:

"That youngster has some notion in his head of where to look for theinfernal criminals. And, ten to one, his idea is a good one that willbear fruit!"

CHAPTER XX

A BRIGHT LOOK AND A DEADLY WARNING

Jack's employer gave him rather too much credit in supposing that theboy had already worked out the problem of finding those who had madethe attack on the "Benson. "

As the submarine boy left the breakfast room he felt as much in the darkas ever. The only known spies who were still at large, for some reasonknown only to the Secret Service men, were M. Lemaire, Mlle. Nadiboffand Kamanako. 

"This is rather earlier than either of that pair in the habit of showingthemselves, " muttered Benson, as the first two names crossed histhoughts. "I wonder whether I could get the least bit of an inkling bygoing to the jail and talking with Gaston? If I could bluff him intotelling me anything, it might be so much gained. I might catch him offhis guard, if I could get him angry enough. "

Full of this interesting idea, the submarine boy strolled slowly alongto the little jail, forming his plans as he went. 

Arrived at the jail, Captain Jack found the keeper, as yet, in ignoranceof the dastardly attempt that had been made on the submarine boat thenight before. He listened, aghast, as Benson told him the whole story. 

"Now, I've got a notion that Gaston's crowd are very likely at thebottom of this whole deal, " continued the submarine boy, in a low tone. "For one thing, while perhaps nothing much can be done to the otherspies, this fellow, Gaston, is in here for a crime which, under theFlorida laws, will go hard with him. It means that he'll be locked upfor a few years. That may make both him and Lemaire ugly enough to putthem up to almost any mischief. Was M. Lemaire here to see the fellowyesterday?"

"Lemaire has not been hero at all, " replied the jailer. 

"Was Mlle. Nadiboff here to see him yesterday?"

"No; she has been holding aloof. With the exception of his lawyer, the only people who ye been here to see Gaston were two fellows whocame yesterday, about noon. "

"Oho!" muttered Benson. "Who were they?"

The jailer turned to reach for a memorandum book. 

"I keep the names given by all who come here to see prisoners, so Ishall be able to answer you. "

"Ah, here are the names. One fellow called himself Leroux, the otherStephanoulis. "

"One name French, and the other Greek, " muttered the submarine boy, thinking hard. "What did they look like?"

The jailer quickly and carefully described the pair. Jack listenedattentively. Then rose, briskly. 

"Did you hear any of the conversation they had with Gaston?"

"No. "

"If they come again to-day can you lock them up and hold them?"

"If I have proper authority. "

"If you get a telephone message from Mr. Trotter, would that be goodenough authority?"

"Yes; on that I could hold them long enough to give Trotter a chance tocome here and take them or else to get them committed on a regularwarrant. "

"If you keep within sound of your telephone bell, then, I think you'llhave authority within a few minutes, " replied Jack, briskly. 

"That's a live, hustling boy, " muttered the jailer, looking afteryoung Benson through a window, as the submarine boy hurried away. 

Before he had gone far, Jack encountered one of the nondescript surreys, hauled by an antiquated nag and driven by a battered darkey, that oftendo duty as cab in Florida. Poor as the rig was, it offered a chance ofgreater speed than Captain Benson could make at a walk, so he quicklyengaged the rig and was driven to the place where the Secret Servicemen were stopping. 

"You've brought us the only thing like a real clue that we have, "declared Mr. Trotter, very frankly, after he had heard Jack's story. "Wait a moment, and I'll have Packwood get busy over the telephone. "

Within the next twenty minutes not only had the jail been telephonedto; Packwood also talked with all the nearby railway stations in thatsection of the country. 

"If those rascals can be found, " declared Trotter, "I think we shallhave gone a long way in clearing up the matter. As you say, the fellowGaston has more reason than any of the rest of the crowd to want acomplete revenge against you. "

Then Mr Packwood left to walk through the little town around SpruceBeach, to see whether he could encounter any two worthies who answeredto the description of Leroux and Stephanoulis. 

Before half-past nine, however, word came that local constables at alittle railway town a dozen miles away had arrested a couple of suspectsand were bringing them to Spruce Beach. The prisoners had been takenwhile waiting for a north bound train, and had tickets all the waythrough to New York. 

Then Jack hastened back to Messrs. Farnum and Pollard to report what wasin the air. 

"By Jupiter, Jack, I knew you had some thing strong in your mind whenyou left us, " gasped the shipbuilder. "But I didn't imagine you'd rundown the wretches as swiftly as that. "

"We don't yet know that we've got the right hair, " replied Captain Jack. 

"I'm willing to wager money on it, if it comes to that, " retorted Mr. Farnum. 

Before noon the two prisoners were brought into Spruce Beach. Trotterand Packwood stopped, in a 'bus with the prisoners, to show them to Jackat the hotel. 

"That pair look rascally enough to do any dirty trick, " declared JacobFarnum, in high disgust, as he looked over Leroux and Stephanoulis. 

The prisoners were, indeed, "hard hooking. " Both were men below averagesize, with sullen, defiant eyes. Both were dressed roughly, likelaborers. Yet, when taken, each had been found to have a considerablesum of money about him. 

"We can't make either of the fellows talk, but maybe they will later, when we begin to employ some of the third degree on them, " whisperedMr. Trotter to Jack. "My boy, I think you've put us on the real trail. If the jailer identifies them as Gaston's callers of yesterday, we'llknow where we stand. "

Fifteen minutes later the Secret Service men returned. The jailer hadpronounced the pair to be Gaston's callers of the day before. Moreover, the jailer had obligingly locked up the pair until Trotter and Packwoodcould obtain proper authority for him to hold them. Leroux andStephanoulis had been placed in cells from which they could not possiblycommunicate with Gaston, whose cell lay in another wing of the jail. 

"As soon as that pair found that, for some reason, their mine failed toexplode under you last night, " Trotter hinted, "they knew that theirgame was up. They hurried away and lay concealed in the distance. Thenthey saw the party from the 'Waverly' hunting on shore, with lantern's, and they took to the woods. That pair of rascals knew how risky it wouldbe for them to try to leave at the local railway station today, so theystruck off through the woods on foot making for another town at adistance. The constables who brought them down here say that Lerouxand Stephanoulis were a surely astonished pair when they foundthemselves nabbed. We are getting into a bigger nest of trouble downhere than we expected when we left Washington. "

After, the Secret Service men had gone, Jacob Farnum turned as though togo inside the hotel. 

"I'm wondering whether there are any letters for me, " he said. 

"I'll go to the office and inquire, " proposed Jack Benson. At the deskhe received two letters for his employer, and turned away with them inone hand when his steps were arrested by the sound of a sweet femininevoice at the further end of the desk. 

The speaker was Mlle. Nadiboff. 

"She looks as sweet and as contented as ever, " thought the submarineboy, with some wonder. "Really, she doesn't look as though a care hadcrossed her path. "

"Can you furnish me with a chauffeur, and order my car up?" Mlle. Nadiboff was inquiring. 

"I am very sorry, Mademoiselle, but we haven't a single chauffeur thatwe can spare, " replied the clerk, respectfully. 

"Then may I rent one of your own cars, with a man to drive it?"

"Again, I am very sorry, Mademoiselle, but all the hotel cars areengaged. "

The pretty Russian stamped her foot impatiently. 

"Oh, no matter, then, " she cried. "I will go to the garage and takeout my own car. I know how to manage it. "

"I regret very much to have to report, Mademoiselle, " replied the clerk, speaking as respectfully as ever, "that one of the hind wheels has beenremoved from your car. "

Mlle. Nadiboff stared at the clerk in amazement. 

"Who has dared do such a thing?" she demanded, angrily. 

"I am sorry, but I do not know, " answered the clerk. 

"Then I suppose it would be impossible, even, for me to hire one of yourlivery rigs?" she continued icily. 

"You have guessed right, Mademoiselle. "

"Oh, but this is insupportable!" cried the pretty Russian, turning away. 

As she did so, she caught sight of Jack Benson for the first time. 

"Oh, I would like just a word with you, my Captain, " she called softly, moving after the boy, who had started toward the door. 

She overtook Jack, resting a gloved hand on his sleeve. 

"Do not stop, " she urged, softly. "I will keep on with you, out ontothe veranda. "

In silence Jack stepped outside with her. Mr. Farnum had vanished forthe moment, so Benson was alone with his pretty companion. 

"Now, tell me, my Captain, " she begged, "why it is that I cannot geteither my own car, or any other conveyance, for a little drive?"

"I could only guess, Mlle. Nadiboff, and you can do that as well asI, " Jack replied, gravely. 

"But I desire you should guess for me, my Captain. What do you say?"she insisted, her eyes scanning his grave face. 

"At the risk of seeming rude, Mademoiselle, I am not going to be pryingenough to make any guesses about your affairs, " Captain Benson answered, quickly. 

He thought he had gotten out of the matter as cleverly as it could bedone. 

"Some one is taking altogether too great an interest in my affairs, myCaptain. I trust you have no hand in it, for it is possible thatinterference with my comfort will prove dangerous to the offenders. Yet, pardon me, for I am sure that you, my Captain, would not causeme any uneasiness. Let those who do beware!"

As she let go of his arm and turned to go inside, Mlle. Nadiboff'ssmile was bright, almost friendly. Yet back of that smile, in herexpressive eyes, lurked a look that made the boy start. 

It was a look that spoke of deadly, things, and Captain Jack Benson hadcome quite to believe that Mlle. Nadiboff could be not only quite deadlyat need, but also equally reckless. 

CHAPTER XXI

A FRENCH RAT IN THE CORNER

As Mr. Farnum came around a bend in the veranda Jack hurried to him, handing over the letters. Then he related the little scene he had justwitnessed in the office, and described how Mlle. Nadiboff had walkedout with him. 

"So the little minx was hinting at more mischief to come, was she?"demanded the shipbuilder. "Jack, I believe she's equal to it. Hercrowd are anyway, if it's true that Gaston, from his cell in jail, couldplan the attempt to blow the 'Benson' last night. "

Hal, too, soon came up and heard. He turned anxious gaze upon his chum. 

"Jack, old fellow, " he pleaded, "I know you're not much given to beingafraid of things. But, at least, look out for yourself a bit. Be moreprudent than you usually are about yourself. That crowd of foreignspies, having failed and having brought themselves into trouble, meanto have revenge. Any of us are liable, but you'll be the shiningmark of all to be picked out. "

"There can't be many more of that crowd left at large, " laughed Jack, lightly. 

"I wonder why the Secret Service men don't arrest Lemaire and theNadiboff young woman?" asked Mr. Pollard, the last to rejoin the littlegroup. 

"Trotter and Packwood must have some good reasons of their own, " Jackreplied, thoughtfully. "For one thing, they hardly have any evidencethat they could use against the pair. "

"They could at least drive them from Spruce Beach, " retorted the inventor. 

"Perhaps the Secret Service man are giving the pair enough rope for theirhanging, " proposed Jack. 

At that moment the two detectives were espied going past in a buggy. They waved their hands to the party. Jack replied by a signal to halt. He and Hal ran down to the road to speak to the detectives. 

"If it's a fair question to ask, " demanded Hal, "what are you going todo with Lemaire and Mlle. Nadiboff?"

"To tell you the truth, we don't know, " Trotter answered. "We haven'tanything we could very well fasten on them. But of this you may besure; our various moves are known to them, and they're on thetenterhooks of anxiety wondering what's going to break loose next. Morethan that, both are sharp enough to have guessed that it would beimpossible for either of them to get away from Spruce Beach, now, withoutour leave. But we'll have to leave you, now, boys. You've been of somuch help to us that I don't mind telling you what we're up to at thismoment. We're driving back to jail, and we're going to try to put thescrews on Leroux and his Greek companion. If we can make 'em thinkwe've gained new evidence against 'em, they may get scared and beginto talk. If they talk fast enough, they'll begin to tell some truth. "

The buggy rolled along again. 

"You didn't tell them a word about Mlle. Nadiboff's threats to you, "muttered Hal. 

"I didn't mean to, " Jack replied, simply. 

"Why not?"

"Well, for one thing, I couldn't swear that she did threaten me. Shemay have meant it all for nonsense. "

"Yes, " mocked Hal Hastings. "That, would be just like her!"

The submarine not being due to go out that day, the chums decided toremain on shore, in order to keep in touch with the march of events. The day was so balmy that Mr. Farnum dropped into a chair on the porch, Pollard occupying the chair next to him. Hal, buying a magazine atthe hotel news stand, sat on the edge of the porch, his feet touchingthe ground. Jack, his mind too full of problems to permit him toread, paced up and down the grounds. Finally he strolled, out pastthe gate, crossed the road and began to stroll along the shingle ofbench. 

Jacob Farnum removed his cigar from between his lips long enough toremark:

"As long as the lad keeps in sight, Pollard, it will be worth our whileto keep an occasional eye on him. "

"And when he goes out of sight--? asked the inventor, slowly. 

"It will be high time to call him back. Somehow, Dave, I'm growinguneasy over the boy. I can't help the feeling that he's running intoa good deal of danger that's likely to explode under him at any moment, just as that mine was intended to last night. "

"It makes one feel uncanny to be at Spruce Beach, " growled the inventor, savagely. 

"Well, we can't run away, " retorted Jacob Farnum, blandly. 

"Why not, if we feel like it?"

The shipbuilder laughed. 

"Why, Dave, a spirited lad like Jack Benson would be furious overanything that looked like a retreat. He'd be savage. Now, Dave, wecan hardly afford to put such a slight on the boy who has had so muchto do with our success. "

"I suppose not, " grunted Mr. Pollard, settling back in his chair. 

"The odd part of it, " said Farnum, presently, "is, that while we're thecenter of an international cyclone, so to speak, the rest of the folksat Spruce Beach don't know a word about it. Look at the crowds offolks around us who haven't even a breath of an idea of what hashappened, or is, likely to happen. Not a soul around here, except ourown few, have any idea that an attempt was made, last night, to blow upthat mysterious-looking little submarine craft riding at her mooringsout yonder. "

"I wonder what the crowd would do, if it did know?" asked Pollard, gazing out curiously over the throngs of pleasure-seekers. "That showswhat a dreamer you are, Dave, and how little you know of your own fellowcitizens. What would the crowd do? Why, it would change itself intoa mob. Mlle. Nadiboff would be hustled off out of town, Lemaire wouldbe lynched, or mighty close to it, and it would be strange if the mobdidn't march on the jail itself. "

"Then it would never do to let the crowd know all that's happening, would it?" asked Pollard. 

Jack, from thinking over the problems that had come up in connectionwith the spies, had at last let his attention wander to the crowds. Down at the beach hundreds were taking an afternoon dip. Other hundredswere strolling up and down the sands. Children were building sandcastles or houses. A good many small boats were out with pleasureparties. Yet many, both grown-ups and children, looked positivelybored. They needed excitement. 

"How near this crowd came to having something to talk about, " mutteredyoung Benson to himself, with a smile. "If that mine had gone offlast night, no one at Spruce Beach would have felt dull to-day. "

Finding that the afternoon air was making him dull and inclined to gape, Captain Jack turned back from the beach. He sauntered along the road, and was about to cross it, when he heard a sharp snap. It was like asubdued shot. 

In the same instant a hissing sound went _pseu_! in front of his face. A distinct breeze, small though it was, fanned his eyes. Then chug!Something landed in the trunk of the tree he was passing. 

"That was a shot!" guessed the submarine boy, like a flash, and in thenext breath he muttered: "Aimed at me, too!"

Jack pitched forward, falling upon his face. If one shot had beenfired, another might be as soon as the unknown marksman realized thathe had missed. 

Several people, near by, fancied they had heard a shot, and turned, curiously. Then, as soon as Benson was espied lying on the ground arush was made in his direction. 

At that moment Hal Hastings happened to be looking over toward the beach. Like a flash he was up and away, his magazine falling from his lap tothe ground. 

"Now, what on earth has taken Hastings off like that?" demanded Mr. Farnum, looking around in surprise. "There are other people running, too. Come along, Dave!"

Hal shot his way through the rapidly gathering crowd. He reached JackBenson just as the latter leaped up, laughing. 

"Why all this excitement, just because I stubbed my toe against adew-drop and fell?" demanded Benson, laughing. 

"Weren't you shot?" gasped Hal. 

"If I was, I'll make the rascal prove it, " asked back Captain Jack. "But, now you mention it, I think the tree _was_ hit. "

Jack turned and looked the tree trunk over at about the height of hisown head from the ground. 

"See here, " he remarked, laying a finger on a small perforation in thebark, "I think a bullet, or something of the sort, went in here. "

"We'll soon find out then, " proposed Hal, whipping out his jack-knife, opening a blade and beginning to dig. The crowd grew in size. Messrs. Farnum and Pollard had great difficulty in forcing their way through. 

After some time spent in patient work Hal dug out a steel-jacketedbullet, short and of small calibre. 

"You want to find the man with a weapon that bullet fits, and then makeit warm for him, " advised one man in the front rank of the crowd. 

"Why?" queried Captain Jack, coolly, examining the missile, then droppingit carelessly into his pocket. "Some fellow fired an accidental shot, very likely, and is at this moment the most scared man at Spruce Beach. What's the use of jumping on anyone just because he had a moment ofcarelessness?"

"That's right, young level-head!" nodded another man, approvingly. 

Messrs. Farnum and Pollard hung back somewhat. They were near enoughto hear and see, and they had their instant suspicions. But the crowdknew nothing of the spy outrages, and it was not necessary to informstrangers. 

So, within a few minutes the crowd broke up, straying off in quest ofsomething more interesting. The submarine party kept on up to the hotelporch. 

"That was a revengeful move, pure and simple, " declared Jacob Farnum, ina low voice. 

"Of course, " assented Jack. "It's going to be something of a taskthough, to find out, for certain, just who fired that shot. "

Even as the four stood there on the veranda a door opened, and M. Lemaire, faultlessly attired for an afternoon stroll, stepped out. 

"Ah, good afternoon, gentlemen, " was his unconcerned greeting, as herecognized the quartette. 

This French spy had evidently dressed himself with a good deal of care. He carried himself with much precision and lightly twirled a natty cane. 

"Pardon me, monsieur, " spoke Jack, stepping forward, and looking pastthe Frenchman; "is that one of your friends down the road?"

As the Frenchman turned to look, young Benson swiftly and adroitly tookhis cane from him. 

Like a flash, his eyes full of fire, Lemaire heeled about, then leapedat the young submarine captain. 

But Hal Hastings stepped between them so neatly that the Frenchmancollided with him instead. 

"Hold this fellow a moment, please, " requested Captain Jack. "I've foundsomething interesting. "

Hal Hastings grabbed Lemaire's right arm. Jacob Farnum instantlypossessed himself of the other. David Pollard sprang forward so thathe could take a hand, if need be. 

Captain Jack stood holding the spy's walking stick, ferule end upward. It was a rather long, slender-looking ferrule of steel. But whatinterested young Benson most was that he had found that the ferrulewas hollow. 

Quickly the submarine boy examined the rest of the cane. 

"Release me! Hand that stick back to me!" hissed the Frenchman. "Oh, some one shall pay for this unpardonable outrage!"

But Hal and Mr. Farnum only gripped the spy the more tightly. 

"I believe I've found out something, " announced Jack, in a low voice. "Wait a second or two. "

He had come upon a concealed spring near the head of the cane. Steppingto the edge of the porch, the submarine boy pointed the ferrule end atthe ground, then pressed upon the spring. 

A sharp, though not loud report followed, and a bullet plowed into theground. There was a flash at the end of the ferrule, though but abarely perceptible amount of smoke. 

"So, M. Lemaire, you carry a pistol cane, that uses smokeless powderand shoots steel-jacketed bullets?" inquired Jack, turning to theprisoner, who, white-faced, stood gnashing hi's teeth in helpless rage. "I wonder if the bullet Hastings dug out of the tree trunk will be foundto fit this weapon?"

"You miser-r-r-rable dog!" screamed Lemaire. "Thief! Liar!"

"Oh, keep cool about it, do, " urged Jack, smilingly. 

"What's this?" demanded Trotter, suddenly appearing on the scene. Packwood was just behind him. 

Jack swiftly told what had happened, and what he had just discovered, at the same time passing the cane to the Secret Service man. 

"Lemaire, I guess you'd better come with us, for safe-keeping, " advisedTrotter, dryly. 

"You ar-r-rest me?" snarled the Frenchman. 

"Oh, yes; if you insist upon a name for it. "

M. Lemaire's face looked uglier than Jack had ever dreamed it possiblefor a man's face to look. As Hal and Farnum let go his arms the spytook a quick step toward Jack Benson. 

"Stop that!" commanded Trotter, sharply, leaping to grab the spy. 

"I only want to say one word to this young scamp!" hissed Lemaire. "I will not hurt him. "

"You can wager he won't, " added Captain Jack, clenching his fists andwatching the other alertly. "Let him speak to me, if he wants. "

Trotter thereupon halted, though he watched the Frenchman with lynx-likewakefulness. 

Lemaire, however, merely leaned forward until he had placed his lipsclose to one of the young submarine captain's ears. 

"See here, " hissed the spy, "hold your tongue about everything, andmake sure Gaston and myself are released. Else, no corner of the earthwill be a safe place for you. You can find no place in the world whereyou will be safe from destruction--unless you get us out of this onebad fix!"

CHAPTER XXII

GALLANT, EVEN TO THE FOE!

"You may have him now, " announced Captain Jack, ironically. "I reckonhe has spoken his piece. "

Trotter's answer was to leap upon the Frenchman, pinioning his armsbehind him. Packwood snapped handcuffs over the prisoner's wrists. 

"Here is the bullet that Hastings dug out of the tree--the one thatwas probably fired at me, " added Captain Jack. "And here is M. Lemaire'scane-pistol. You can see whether the bullet fits the cane. "

Trotter took them, with a swift, admiring look at Benson's cool, handsomeface. 

Then, guiding their prisoner, the Secret Service men moved off hastily, for two or three hundred beach walkers had just discovered that somethingexciting had happened, and were hurrying forward. 

Lemaire was forced into the buggy and driven rapidly away. Once outof sight the Secret Service men turned, driving straight for the localjail. 

Before anyone in the excited crowd could ask what had happened thesubmarine people had vanished. 

These four hurried to a room that Mr. Farnum had reserved while theyremained at Spruce Beach. 

"What was it that rascally Frenchman whispered to you?" demanded theshipbuilder. 

Jack promptly repeated the threat, whereat Mr. Farnum's face grewdecidedly grave. 

"The worst of it is, Jack, I think the fellow not only meant the threat, but has the connections necessary to carry it out, " said the shipbuilder, slowly. "I am quite prepared to believe that these spieswork in large groups, when necessary. I am beginning to think thatit will be wise move to get you way from here--in time. "

"That would give Gaston a fine chance to go clear, " retorted youngBenson. "I am a very important witness when his case comes up. "

"You are also a very important young man for our submarine company, "replied Jacob Farnum, "so important, in fact, that I don't want tohave you put out of this world through any of their plots for revenge. "

"But don't you see, sir, that, if I run away from here, the fellowGaston is very likely to be liberated?"

"Let him go, then, " urged Mr. Farnum, though it was plain that he spokereluctantly. 

"It's just what I won't do, sir. I wouldn't be a good citizen if Ishould allow a criminal to escape justice just because I was, afraidto stay and testify against him, " argued Captain Jack. 

"I admit the force of all you say, " assented Mr. Farnum, slowly. "Yet, if I should find, after thinking it all over, that it will be best toinstruct you to leave here quietly, you won't refuse to obey, will you?"

"Yes, " declared Jack Benson. 

"What? It would be the first time you ever balked at orders, then. "

"But this is different, Mr. Farnum. I refuse to obey any order that willtend to defeat the ends of justice. "

Jacob Farnum winced at that statement of the matter. He had beenanxious only to save Jack from the attempts of a dangerous crowd. 

"Jack is right, " broke in David Pollard, decisively. 

"When he puts the case in that way, I don't dare say that he isn't, "admitted the shipbuilder. "At the same time, I can't bear the thoughtof the lad being butchered to gratify the grudge of any of the rascallycrew that we've offended here at Spruce Beach. "

A slight, rustling sound at the door caused them all to wheel about. Jacob Farnum's eyes beheld a slip of white paper lying on the floor, just inside the door. Jack Benson saw it, also, but he sprang pastthe paper, pulling the door open. 

Around a turn in the corridor the submarine boy heard the sound offleet footsteps. 

Jack pursued, but could find no one, and the sound of moving feet hadalso ceased. As soon as he was satisfied that he could not catch theprowler, the submarine boy returned to the room. 

"Do you see this?" asked the shipbuilder, holding out the slip of paper. 

"Another warning, I suppose?" Benson ventured. 

"Yes; and it shows that you are being followed and watched. Somethingworse is almost certain yet to happen. "

Jack took the slip of paper, reading these printed words:

"You have been fairly warned. Are you going to be a fool? Obey, or--"

That was all. The meaning of the words was plain enough, but Jack, withas cool a smile as ever, folded the slip, dropping it in one of hispockets. 

"This will interest Trotter, " he remarked. 

"There is no use whatever in advising you, suppose?" asked theshipbuilder. 

"If these threats were directed against you, would you cringe fromthem?" demanded the young submarine captain. 

"Of course I wouldn't, " replied Farnum, a sudden flash lighting his eyesas he spoke. 

"Then why should you expect to see me turn coward?"

"I won't say another word about it, Jack!" replied the shipbuilder, gripping his captain's hand. "I have dreaded to see you go down underthe mysterious assaults of these scoundrels. I have hated to see a boycome to that harm while serving me. But I realize, now, that it wouldhurt you worse to run away than it would to stay and face any kind ofpunishment or even death itself. "

"That's the talk, sir, " nodded Hal. "And no one is going to harm him, either. There are too many of us--if we keep our eyes open. "

That "if" covered a wide field of possibilities. Not one of them couldforesee all that the ingenuity of the enemy would provide in the way ofdanger. 

To quiet his own agitation Jacob Farnum had recourse to a cigar. Helighted it, smoking with a very solemn look on his face. 

"What's all the excitement, I wonder?" muttered Hal, presently. 

The distant sound of running feet, then cries came to their ears, though none in the little party could distinguish the words. 

"There's some big excitement on. Come along, " urged Jack, reachingfor his cap. 

"Humph! We've had excitement enough to last reasonable people for a longtime, " grumbled the shipbuilder, but he, too, sprang for his hat. 

Ere they had run far through the corridor they encountered other guestsfleeing. 

"What's the matter?" called Jack. 

"Fire in the south wing, " called back one man. "We don't know, yet, whether the hotel is doomed. "

Just then the fire alarm bell of the hotel began to sound loudly in allthe corridors. 

That brought the remaining guests on the run, some appearing notcompletely dressed. 

As the rushing throng began to thicken at a door on the ground floorthe sound of a whistled of clanging gongs was heard without. TheSpruce Beach fire department was responding to the alarm. 

Captain Jack bounded out. Hal kept close at his chum's heels whileMessrs. Farnum and Pollard came along less fleetly. 

Through half a dozen windows on the second floor of the south wingflames now leaped, while the smoke curled up in dense clouds. Thiswing was built wholly of wood, and was doomed, even though the rest ofthe hotel could be saved. 

Jack halted, at last, Hal bumping into him. 

Some of the firemen were hauling hose from a cart, while others wereattaching an end of one length to a fireplug. A hook and ladder truckwas hauled to the scene, its crew standing by ready at need. 

Whish! Two four-inch streams struck the flames, yet seemed only tofeed them to greater fury. 

"We can't put that blaze out, men!" roared the local fire chief. "Turnthe streams against the main building and stop the blaze from spreading. Let the axe crew follow me!"

Swiftly a couple of long ladders were unlimbered and placed close tothe main building. The fire chief and his men scaled these withagility and tried to fight their way into the rear of the blaze. 

Jack stood scanning the windows on the third floor, just above thepresent belt of fire. Then, through one of the windows on the upperfloor he saw a sudden red glow thrust its way. 

"The fire is eating through to the top, " he turned to explain to Messrs. Farnum and Pollard, who had just reached the boys. 

"I think they'll save the main building, however, " returned Mr. Farnum, as the ringing sound of ax-blows reached them and the heavy streams ofwater were carried after the wielders of the axes. 

"I hope everybody is out, up there in the wing, " uttered Hal, glancingin that direction. 

As if in answer a window was suddenly raised with frantic haste. 

A face, a figure appeared there, framed by the sill and sides. Thena red tongue of flame shot up in the background, illumining the faceof a terrified woman. 

"Why, it's Mlle. Nadiboff!" gasped Jack Benson. 

The pretty Russian shouted down appealingly, though her words weredrowned by the crackling of the blaze and the lusty strokes of thefire fighters. 

"Quick! We must get a ladder up there!" shouted Jack, turning back tothe truck. "We can't let a human being be burned before our eyes. "

But there were no firemen at hand. They had followed their chief. Hundreds of citizens stood about, but they needed a leader. 

"Come on, men!" roared Jack. "Help me off with this longest ladder. "

A dozen pair of hands reached for it at once. Off came the ladder witha bound, while other men pressed up to aid. 

"Right up to the sill of the window where that woman is!" shouted youngCaptain Benson. Up went the ladder, exactly in place, while a scoreof voices shouted:

"Get out on the ladder and come down, young lady! Can you?"

As if in answer, Mlle. Nadiboff was seen suddenly to reel backward asthough overcome by the smoke that poured up at her from the floor below. 

"Where are you going?" shouted Jacob Farnum, hoarsely, as the submarinecaptain threw off his jacket like a flash. 

"Up there--of course--to help her!" Jack shouted back at him, as heleaped at the rungs. 

"It's the only thing a man can do, " admitted Farnum, hoarsely. "Goodluck to you, Jack!"

CHAPTER XXIII

"GOOD-BYE, MY CAPTAIN!"

The first part of the climb was easy. 

Unmindful of the cheers that followed the submarine boy raced up theladder. 

Then he struck the belt of heavy smoke. Flames, too, leaped out at him. He went through that zone of red with all possible speed, yet swift ashe was, he felt as though he were being roasted. 

Then, at a greater height, the boy was forced to close his mouth, barelybreathing, for the smoke surrounded him. He felt as though he werestifling, but he kept on. 

Up on the sill the watching crowd below saw him. Then Jack Benson leapedinside. 

Ah! He could breathe, here, just a bit more, though the smoke hadfollowed him. 

At the further end of the room, by the door that opened upon thecorridor, the flames were eating their way up through from the floorbelow. There was a red barrier there that shut off any hope of retreatby the corridor. 

Yet these things Jack Benson saw only as his gaze swiftly swept theroom. 

Mlle. Nadiboff lay in an unmoving, unconscious heap on the floor, someten feet back from the window. She was in evening dress, as thoughprepared to descend to dinner. 

"She can't go through the line of fire in that rig, " muttered Jack, evenwhile his head reeled from the weight of smoke on his lungs. 

Furiously he sprang at the bed, snatching off the blankets. These hethrew on the floor, rolling the Russian woman up in them. 

Then he bent over to lift her. Ordinarily he could have performed thetask with ease, for his young arms were strong. But now, three-quartersstrangled by the smoke he had inhaled, Jack fairly tottered, with theinsensible human form in his arms, back to the window:

As he stepped out upon the ladder Jack vaguely heard the cheers thatvolleyed up at him. 

To most of those below it looked as though he were moving easily. ButHal, waiting on the rungs of the ladder, just below the fearful beltof smoke and flames, saw differently at a glance. 

Holding firmly to his burden, Jack started down carefully, but as swiftlyas his quaking knees would permit. 

"Come along! Steady with you!" bellowed up Hal Hastings, as he foughthis way up to his chum. 

An instant later Hal growled out

"Let her go. I have her--safe!"

Hal was just above the smoke belt, and his own head was reeling, now. Tongues of flame leaped out at them all. Speed alone could save themfrom one of the most painful of deaths. 

Down through the belt they moved. As they neared the ground willinghands reached out to catch them. 

"Pull those blankets off the girl! They're afire, " shouted one man, and was obeyed. Mlle. Nadiboff, after the blankets had been strippedaway, was carried off, still unconscious though safe as far as fire wasconcerned. 

The clothing of both the submarine boys had caught and was smouldering. Both Jack and Hal submitted to being thrown on the ground and rolleduntil the last spark had been extinguished. 

"Bring milk--a lot of it, for these young men, " ordered a physician whostood in the crowd. For Jack and Hal, on their feet again, leanedalmost helplessly against Farnum and Pollard. Their lungs were sofilled with smoke that both boys felt as though they could never breatheagain. 

When the milk was brought, however, and forced down their throats underthe doctor's orders, they found that this somewhat oily fluid broughtback a good deal of the missing power to breathe. After a while bothboys began to move about again. Yet both felt a strange feeling ofoppression and weakness. 

"For the rest, your feelings will simply have to wear off, " thephysician told them. "You'll be all right in time. And it was a fine, manly piece of work that you both did. "

After nearly an hour of stubborn work the firemen saved the mainbuilding, though that southern wing was practically destroyed. 

When the danger was over hotel discipline asserted itself once more. News was passed that the belated dinner was ready, and the latelyexcited guests filed in for their meal, though many complained of aloss of appetite. 

Neither Jack nor Hal felt like eating then. They sat by Messrs. Farnumand Pollard, though the submarine boys contented themselves with sippingmore milk. 

"That was one way of answering the enemy's threats, " laughed theshipbuilder, in an undertone. 

"We don't know that Mlle. Nadiboff was in any way connected with thethreats, " replied Jack, in an equally low tone. 

"She belongs in the enemy's ranks, " observed David Pollard, dryly. 

As the quartette were leaving the table one of the negro waiters steppedup to them. 

"De lady dat was brought down outah de fiah done wanter see Marse Bensonin de parlor, " announced the waiter. 

"Mlle. Nadiboff?" inquired Mr. Farnum. "Then I guess we had all bettergo in Jack, I'm going to keep you in my sight. "

As they entered the parlor the submarine people saw three or four womenstanding about a sofa on which lay the pretty Russian. 

At sight of the newcomers the Russian signed to the attendants of herown sex to raise her, and then to withdraw. Jack went forward to thesofa, his friends taking seats on the opposite side of the room. 

"Pardon my not rising, my Captain, " begged Mlle. Nadiboff, as JackBenson left his friends to go forward and greet her. "I find I havenot my full strength yet. "

Since she offered her hand, Jack, under the circumstances, took itsimply, then released it. He stood before her in the uniform that hadsuffered in the fire. 

"I am told that you, my Captain, nearly lost your own life in savingmy less than worthless one, " continued the Russian woman. "It was astrange thing for you to--considering. Will you believe me when Itell you that I greatly respect your courage and your manhood?"

"Yes, " bowed Jack. "Though it was nothing but a sailor's easy trick. "

"You would make little of it, would you, my Captain?" smiled Mlle. Nadiboff, plaintively. "True, you risked much for a life that hasbeen worth but little. Still, I sent for you to do more than assureyou of my appreciation of your generosity. "

As she spoke, the young woman thrust one hand into the bosom of herdress. She drew out a little envelope which she held in her hand fora few moments. 

"You have been threatened, my Captain?" she whispered, looking up athim. 

"Oh, ye-es, " assented Captain Jack Benson, shrugging his shoulders. 

"And by very desperate people. "

"So far, " smiled the boy, "they have injured only themselves. "

"Yet you do not know how far their vengeance can reach. "

"Nor shall I lose any sleep thinking over it, " Captain Jack replied, looking down at her with his baffling smile. 

"Your enemies had one trick prepared for you, " whispered the Russian, "that you might have found it hard to meet. "

"Yes?"

"Of course you do not suspect it, but we have even one of the waitershere--a worthless, reckless black--in our pay. "

"It may have been he who thrust the paper under our door before--beforethe fire?" ventured Jack. 

"It was, " nodded Mlle. Nadiboff, seriously. "And it was the samewaiter who, on receiving this envelope from me, would have mixed thecontents with the next cup of coffee served you in the dining room ofthis hotel. But I am overcome by your generosity, my Captain. Takethis envelope--and do not place what it contains in your coffee. "

Though Jack Benson may have started inwardly, his hand did not tremblein the least as he reached out and took the envelope, which he droppedinto one of his pockets. 

"Thank you, Mademoiselle, " he said, simply. 

"There is nothing about me, my Captain, that you can admire, " spoke theRussian woman, sadly. "I have not led the right kind of life. But Ihave just that grain of good in me that enables me to admire one asfine and manly as I have found you to be. You have given me mylife--a worthless one, at best. So I give you your life--and may youmake as splendid use of it as you have started out to do. And now, good-bye, my Captain. You cannot continue to know such as I. "

Despite what he knew of this dangerous woman, Jack Benson felt himselftouched. 

"What is going to become of you, Mademoiselle?" he asked. "Will yoube dragged down in the snares that have entrapped your confederates!"

"I do not know. How could I know?" she asked, looking quickly up athim. "Yet, if my accomplices escape, and find that I have served you, my Captain, do you know the forfeit they will exact?"

"Your life?" whispered Benson. 

"Yes!"

"Then, if I can, I am going to help you to escape them, " promised thesubmarine boy. "Yet that can happen only on your most solemnword--given, pardon me, in a moment of absolute honesty--that you willnever again play the spy, for the secrets of the United StatesGovernment. "

"Oh, I will promise that, " replied Mlle. Nadiboff, quickly. "Yet Ihardly need to. After what I have done, just now, no one in mypeculiar line of work would ever trust me again. I shall be shunned, hereafter, if not destroyed, by those who have worked with me. "

"I shall do my best to get you safely away from Spruce Beach, " promisedJack Benson. "Have you more to say to me, Mademoiselle?"

"Nothing, but good-bye, my Captain. "

She held out her hand. Once more Jack took it, bending low over it. Tears shone in her eyes, but Jack did not see them, for he turned, going back to his friends. 

Not until they were well away from the parlor did Jack Benson offer anyaccount of the interview that had just taken place. 

"Let me have that envelope, then, " requested Jacob Farnum, gravely. 

"What are you going to do with it, sir?" Jack asked, as he passed itover. 

"Do with it?" repeated his employer. "I'm going to take it to thenearest druggist, and find out what the stuff is. "

"We'd better take this latest news to our friend Trotter, " suggestedDavid Pollard. 

"By all means, " nodded Farnum. "And I'll meet the rest of you there. "

The little house wherein the Secret Service, men had taken up theirheadquarters was not far away. When the inventor and the submarine boysrang the bell Mr. Packwood admitted them. 

"Step right into the next room, " advised Mr. Packwood. "You'll find someone there you know. "

A the submarine folks entered the room they saw Trotter seated at atable on which were writing materials. At the other side of the tablestanding very erect, and in a very respectful pose, was the Japanese, Kamanako. 

CHAPTER XXIV

CONCLUSION

"Good evening, honorable gentlemen, " said the Japanese, turning when heheard the new arrivals entering. 

"Mr. Kamanako is going to leave us, " announced Trotter, with a smile. "He goes north to-night. Here is the slip of paper, my boy, that willtake you past any meddlesome inquiry. But it is good only untilmidnight, so I advise you to be sure to catch to-night's express. "

"I shall, and thank you, honorable sir, " replied the Japanese, bowing. 

"Then I won't detain you any longer, or you may miss your train. "

Once more the Japanese bowed, then turned to Captain Jack Benson. 

"Honorable Captain, " he said, "I had pleasure to show you somethingabout jiu-jitsu. You did me honor to show me most excellent thingyou called American strategy. I shall not forget it. "

With bows to the others Kamanako quickly took his leave. 

"We had nothing very strong on which we could hold that fellow, so wehad to let him go, " declared Mr. Trotter, after the outer door hadclosed. Then he added, with a sigh: "That's the worst of catching spies, under such laws as we have in this country. Rarely are we able topunish them as they deserve. "

"He won't come back, will he?" asked Jack. 

"Not for a while, anyway. We have made the fellow nervous, and he willgive us a wide berth for a considerable time. "

"Why don't you hit all these people the hardest kind of a blow?" demandedyoung Benson. 

"I wish I knew how to, " sighed Trotter. 

"Then spoil them with too much publicity, " proposed the submarinecaptain. "Let the whole country know all about them and their records, and just how they look. "

"If I could! But how am I to do it?"

"Why, there's a writer here at Spruce Beach, " Jack continued; "a mannamed Hennessy. Let him write all the facts of this whole story, orsuch of the facts as you want made public. Let Hennessy have thephotographs of this spy crew. He can print the yarn in his newspaperand in some magazine, and can use all the photos. Then these peoplewill find themselves so well known that about all of them value as spieswill be gone. "

"By Jove, but that's a clear-headed idea, " muttered Trotter, rising fromhis chair. "It will do the trick, too. Where is this man, Hennessy?"

"Stopping at the Clayton, sir. "

"Packwood, will you go over and get that reporter?" asked Mr. Trotter, turning to his associate. 

In the next minute Jack was telling Trotter of the fire-incident and theenvelope that Mlle. Nadiboff had given him. By the time the submarineboy had finished his recital Jacob Farnum hurried in. 

"That stuff, " he reported, "is morphine sulphate, and the druggist saysthere was enough of it to take you clear out of this world and into thenext. "

"Hm! That Nadiboff woman!" muttered Trotter. "She has been as dangerousas any of them, and yet it is hard to be rough with her after her oneact of gratitude to you, Benson. I could see that she went north onthe train, of course, but she'd be liable to suspicion and punishmentby some of the members of the gang of that infernal Gaston. He has yetother men, I suspect, who may be watching the trains further on, andMlle. Nadiboff, after saving you, Benson, from their latest death trap, might run right into their vengeance. She ought to be gotten away fromhere by some other means. "

"She can be--by ship, " hinted Jack, quietly. 

"Let me see, " mused Trotter. "Yes; that can be done, if you want totake some trouble. At about eleven to-night the Savannah freightsteamer, bound for Havana, will pass by about a dozen miles out. Youcould pick her up by watching for her searchlight. Do you feel likesending Nadiboff to Cuba, in that fashion?"

"If it suits her, we'll do it, " Jack replied quickly enough. 

"It may be very bad for her if it doesn't suit her, " replied Trotter, grimly. "Well, hurry along and see if you can do it. Drummond andMiss Peddensen are going north to-night, also. "

As the submarine party left the house they met Packwood and Hennessycoming along. 

"I think you'll get as good a news story as you can want to-night, " saidJack to the reporter. "You remember, Mr. Farnum promised you one beforethe tip was given to any other reporter. "

Hennessy expressed his, thanks warmly, and the quartette hastened on tothe hotel. Captain Jack had little difficulty in seeing Mlle. Nadiboffin the parlor. When he explained to her the plan, she gladly accepted. 

"You will not believe me, my Captain, " she smiled, wearily, "but I amwholly through with spying. I shall never again disgrace my womanhoodin that way. "

Owing to the fire Mlle. Nadiboff was not burdened with baggage. Shecarried her evening dress in a new dress suit case bought by Hal at oneof the stores. In going away she wore a plain gray dress and darkbrown jacket purchased from one of the maids at the hotel. Mlle. Nadiboff's jewelry and money, with which she was well supplied, had beenin the hotel safe, so that she left with the means of pursuing herjourney in comfort. 

"It is a whim of mine, my Captain, " cried the Russian, gayly, as theyleft the hotel, "but will you give me your arm down to the shore?"

"Gladly, " Jack agreed. 

They took a shore boat and went out to the "Benson. " While CaptainJack helped the pretty visitor aboard Hal hastened below to bring herup a chair. 

"You have your wish, at last, Mademoiselle, to visit this craft, " Jacklaughed, then added, gravely: "I am sorry, indeed, that I cannot inviteyou below. "

"I have lost my desire to see the interior of the boat, " she replied, with equal gravity. 

A start was made in plenty of time. Gayly the "Benson" bounded out overthe waves, as though even that grim little steel craft of war couldappreciate the fact that its dangers were over. 

In time Captain Jack picked up the Havana bound freighter by the rays ofher searchlight, and moved on out to intercept her. He signaled thathe had a passenger to put aboard. The steamship lay to, lowering aside gangway, and the "Benson" ran neatly in. The transfer was made. 

Just as she was helped over the side Mlle. Nadiboff placed her hand inJack's. 

"Good-bye, my Captain, " she said, sadly. 

"Good-bye, Mademoiselle, " answered the submarine boy. "And remember thatyou are done with the spies. "

"Forever! Again, good-bye, my Captain. "

As both craft moved off on their respective courses Captain Benson saw alittle white handkerchief fluttering at the freighter's stern rail. Aslong as it could be visible over the waters that handkerchief fluttered. "I guess the little Russian must have tied her handkerchief there, "observed Eph, dryly, and Captain Jack smiled; while Jacob Farnum turnedto whisper to the inventor:

"Dave, our youthful captain has the greatest respect in the world fora woman, but he'll never be made a fool of by one of the wrong kind. "

Henceforth, as long as she remained at Spruce Beach, the submarinecraft was wholly unmolested and avoided by spies. Gaston, who turnedout to be the real leader of one party, instead of M. Lemaire, wassentenced to prison for assault. Leroux and his Greek accompliceconfessed to the attempt to explode the mine under the "Benson, " andwere sent to the penitentiary. There, also, journeyed M. Lemaire, for a long term, on account of his all but successful shot at JackBenson. 

With the exception of those sent to prison none of the spies have asyet been heard from. 

For a considerable time the "Benson" remained at, or near, Spruce Beach. Hennessy's articles attracted great attention to the craft. The Navypeople were charmed by the new capabilities shown by this latest of thePollard submarine boats. 

Later the submarine boys were destined to turn their attention to newand thrilling work with submarine craft And now came most stirringtimes that put their grit, intelligence and resource to the hardestkind of tests. 

These newest happenings will be related in full in the next volumeof this series, which will appear under the title: "_The SubmarineBoys' Lightning Cruise; Or, The Young Kings of the Deep. _" The readerof this new volume will find a rare treat in store for him!