Chapter

I Vacation Plans

II Tragedy or Joke

III Talking it over

IV The Catwhisker

V A Baffling Situation

VI A Mystery and Cub's "Goat"

VII Returning Cub's "Goat"

VIII Mathematics or Geography?

IX The Radio Diagram

X The Island-Surrounded Island

XI The Deserted Camp

XII Hal's Discovery

XIII "Robinson Crusoe's" Diary

XIV More Light and More Mystery

XV The Hook-up on Shore

XVI Running down a Radio Fake

XVII Bud's Discovery

XVIII Unwelcome Visitors

XIX "S.O.S." from Friday Island

XX Four Prisoners

XXI The Hostage

XXII The "Crusoe Mystery" Deepens

XXIII "Sweating" the Prisoner

XXIV "Something Happens"

XXV Bud Shoots

XXVI The Slingshot Victim

XXVII Chased out

XXVIII A Radio Eavesdropper

XXIX The End of the "Mystery"

XXX The Result of a Radio Hazing

CHAPTER I

Vacation Plans

"Now, fellows, what are we goin' to do this vacation?" demanded Cub Perry as he leaned back in his upholstered reed rocker and hoisted his size 8 shoes onto the foot of his bedstead. "School's all over, we've all passed our exams, and now we've got a long vacation before us with nothing to do. It's up to yo-uns to map out a program."

"Why can't you help map it out?" asked Bud Taylor with something of a challenge in his voice. "You always have the last word?"

"Cub's the dictator of our outfit, and we do the work, that's why," declared Hal Stone. "We always have to listen to him, you know that, Bud. So what's the use o' kickin'?"

"Oh, I'm not kickin'," Bud replied. "It's no use. Cub 'u'd drown us out with his voice if we hollered. You know you made 'im admit once that noise was the only thing that 'u'd convince him."

"You c'n change that now and call it static instead of noise since we've all become radio experts," smirked Cub with characteristic superiority.

"Ha, ha," laughed Bud.

"Tee-hee," tittered Hal.

By the way, it was from this peculiar manner of laugh, that Hal got his nickname, Tee-hee. Cub's given name was Robert, shortened sometimes to Bob and Bud's was Roy. Cub and Bud were always known by their nicknames, but Hal was addressed as Tee-hee only on fitting or intermittent occasions.

The three boys were seated in Cub's room at the Perry home, one of the largest and most interesting samples of domestic architecture in the City of Oswego, on the shore of Lake Ontario. Cub was a rich man's son, but he was constitutionally, almost grotesquely, democratic. There was nothing that would make him angrier, to all appearance at least, than open reference in conversation to the wealth of his father. For such offense he was ever ready to "take off the head" of the offender. However, once in a while one of the bolder of his friends would beard the lion in his den more or less successfully. But it was necessary for such venturesome person to be ever in command of ready wit in order to emerge with a whole skin, figuratively speaking, and Bud and Tee-hee were the real leaders of this victorious few. That was the reason why they were chums of Cub.

The fact of the matter, to be perfectly frank, was that Cub was a good deal of an actor. Whether he was conscious of this fact we will not venture to say. He is the only one who knows, and we have never broached the subject to him. The average person on first making his acquaintance doubtless would set him down as a very domineering youth; some might even call him a bully, but they would change their minds eventually if the acquaintance continued. Perhaps the best way one could judge Cub, without being Cub himself, would be to characterize him as being fond of playing the bully just for fun. Indeed, it is quite probable that Cub carried a perpetual laugh in his sleeve.

This dominant youth was tall and lanky. He was only 17 years old, but as big as a man, so far as altitude and the size of his feet were concerned. He lacked one inch of being six feet tall, and he wore size 8 shoes. The hope for his proportion was expansion, and judging from the hereditary history of his paternal ancestry, there was good prospect for him in this regard. His father was a large man and well built.

To complete the description of Cub, he was a youth of very wise countenance. He liked to read "highbrow stuff" and reflect and inflict it on such victims as were unable to counter his domination.

Bud was a short, quick, snappy, bold fellow, "built on the ground". It is possible that he might have upset Cub in a surprise wrestle, but nobody ever dared to "mix" with Cub in such manner; the lanky fellow seemed to be able to out-countenance any suggestion of physical hostility. The glower of his face seemed to spell subjection for all the boy world about him.

But Bud would blurt out something now and then that seemed to startle Cub into a mood of reflection, and whenever Cub reflected his dominance wavered. Tee-hee was able to accomplish the same effect without a "blurt". Tee-hee was sly, "as sly as they make 'em", but it was a kind of slyness that commands respect. It even gave an air of respectability to his laugh, for, ordinarily, a "tee-hee" sounds silly. But Hal's "tee-hee" was constitutional with him, and his sly shrewdness gave it real dignity.

Cub was usually the dominating factor in all the boy arguments of their "bunch", which varied in numbers from ten to twenty, according to the motive of interest that drew them together. He seldom started an argument, unless his disposition to "bawl" somebody out for uttering a, to him, foolish opinion, he regarded as a starter. He seldom spoke first, but usually last. One day he "bawled" Tee-hee for the latter's "silly laugh", telling him that he would never be a man unless he learned to "laugh from his lungs".

"You seem to like a lot of noise," Hal observed.

"Yes, it's the only thing that convinces me," Cub shot back rashly.

He realized his rashness, but it was too late. Tee-hee "got" him.

"I understand you now," the sly youth announced. "Whenever we have a dispute, the only way for me to win is to make a bigger noise than you do."

But Cub was not slow, and he evened matters up by roaring:

"You can't do it; you ain't got the lungs."

However, there was a serious side to this trio of radio boys. They were not known chiefly for their frivolity, which probably would have characterized them if they had got into any bad scrapes. Their deportment was really above reproach, so that their parents reposed a good deal of confidence in them and allowed them to do pretty much as they wished in the matter of their recreation and sports. On the occasion with which the narrative opens we find them very serious minded over a very important problem, although it seemed well nigh impossible for them, even under such circumstances, to bar severely all manner of gaieties.

"I don't see where there's anything new for us to do this summer," said Bud after the merriment over the "static repartee" with Cub had subsided. "We c'n go camping or fishin', or we c'n stay at home and listen in."

"Oh, you haven't got any invention in that head o' yours, Bud," declared Cub with tone of disgust. "Tee-hee, take your turn and see if you can't hand us somethin'."

"Aw, why don't you furnish some brains for us, Cub," Bud objected with spirit. "I never knew you to yet. You just razz us till we turn up the thing all of us wants, and then you act as if you'd done all the work."

"Well, what do I pay you for?" Cub demanded, with an air of final judgment.

Of course, Cub did not pay them anything; that was just a little evidence of his exasperating domination. Bud saw, as usual, that there was no use of trying to carry his protest further, so he gave way to Hal, who looked as if eager to take his turn.

"I tell you what let's do," proposed the latter. "Let's go campin' and take one of our radio sets with us."

Cub leaped to his feet enthusiastically, bringing his feet down on the floor with a force that seemed to jar the whole house. Fortunately there was a substantial rug between his descending number 8's and the floor.

"That's what I call brains, Tee-hee," he declared, reaching over and planting a hearty slap on the author of this ingenuity. "You deserve a bonus. The scheme is hereby adopted."

"Without consulting me?" demanded Bud with very good simulation of hurt dignity.

"Absolutely, Bud, you fell asleep and let Tee-hee get ahead of you."

"And meanwhile, what did you do?" Bud inquired pointedly.

"I sat in judgment over your suggestions," Cub replied readily. "You fellows needed somebody to decide what your suggestions were worth. That's my function—get me?—my function."

"Well, I was goin' to vote for Tee-hee's idea," said Bud with slight tone of resentment. "You might 'ave let me get my vote in."

"It wasn't needed, it wasn't needed," Cub ruled. "Two's a majority of three."

"I'm going to vote for it anyway. I think his idea is a dandy."

"Your vote is accepted and recorded as surplus noise."

"Static, you mean," Bud suggested with modest sarcasm.

"To be up to date, yes."

"Tee-hee," laughed Tee-hee.

CHAPTER II

Tragedy or Joke?

The three boys discussed vacation plans along the line suggested by Hal for half an hour, and then Cub said:

"We can't get any further on this subject to-night. It's nearly 8 o'clock; Let's go in the radio room and listen to some opera music for a while."

He led the way into an adjoining apartment, a veritable radio laboratory. Two years before, as a wireless amateur, Cub had built for himself in this room an elaborate sending and receiving set, and he proved to be one of the first, boy though he was, to appreciate the outlook for the radiophone, even before "the craze" had gripped the country. He soon had his father almost as much interested in the subject as himself, so that the question of financing his latest radio ambition was no serious obstacle. An early result of this active interest on his part was the addition of a receiving amplification with which he could listen in to messages from major-power stations in the remotest parts of the country. Indeed, under favorable conditions, he had picked up messages from as far distant points as Edinburgh, Scotland, and Australia.

Cub sat down at the table and tuned to 360 meters. The other boys seated themselves comfortably and waited with a kind of luxurious contentment for the beginning of the program, which came in a few minutes. They "sat through" the entire Westinghouse program and then Cub began to "tune up and down" to find out what else was going on in the air. The room for several minutes was resonant with a succession of squeaks, squawks, whines, growls, dots-and-dashes, whistles, and musical notes. Suddenly he gave a start that aroused the curiosity of his friends and made them more attentive to his actions.

"Did you get that?" he shouted.

"No," replied Bud and Hal, in chorus, springing forward.

Cub was tuning excitedly back and forth about a certain, or uncertain, wave length, which he had lost.

"Put on your 'phones," he said, putting on his own. "You may not get it through the horn. I'm sure I got an SOS, very faint. I'm going to try to get it again."

Bud and Hal did as directed and listened with quite as much eagerness as that which was evident in Cub's manner. Several minutes elapsed before the search was rewarded. Then at last, in fairly distinct, although faint, vibrations came the distress signal again. All three heard it, and this time Cub caught the wave "on the knob" and did not let it go.

The operator sending the distress signal was evidently pleading desperately for attention, which nobody, it seemed, was willing to give to him. Several times he repeated his SOS, following each repetition with his own private call and wave length. Then he broadcast the following message in explanation of his appeal for help:

"I am marooned on island in Lake of Thousand Isles. I landed here from a motor boat with wireless outfit. Lake thieves stole my boat and left me here with outfit and little food. Will starve in few days if I don't get help. My call is V A X."

"Cracky!" exclaimed Bud excitedly. "Isn't that a thriller! He's an amateur and in trouble. We're in honor bound to help him."

"How?" demanded Cub derisively. "What can we do here nearly two hundred miles away from him?"

"We might get word to some police or lake patrol that'll go and take him off," Hal suggested.

"He's a Canadian," objected Cub. "Didn't you get his Canadian call? We'd have the time of our life getting a Government station to pay any attention to us hams. But listen, somebody's calling him."

All three listened-in eagerly, expectantly, wonderingly. Apparently this fellow also was a Canadian amateur, although he failed to identify himself.

"Oh, come off, you can't get by with that Robinson Crusoe stuff in this twentieth century," he "jeered" with all the pep he could put into his spark. "Some joke you're trying to play. What kind of publicity stunt is this, anyway?"

"No publicity," was "Crusoe's" reply. "I'll starve if I don't get help. You're doing your best to kill me. Keep out, I won't talk to you any more."

"I will not keep out," declared the other. "You're an imposter. I'm protecting the public."

"Whew!" ejaculated Cub, wiping his brow and snapping over the aerial switch. "I'm going to find out something about this."

A moment later his right hand was working the sending key with the speed and skill of an expert, while blue flames leaped over the gap with spiteful alphabetic spits. Hal and Bud watched him eagerly, and, with a skill indicating long and studied practice, read the message their lanky friend shot through the ether.

First he tuned for a few moments and then sent the call which had accompanied the first Canadian's "SOS". Then he threw back the switch and received a speedy answer. There seemed to be an almost spasmodic eagerness in the manner in which he sent his acknowledgment.

"I heard your call for help," was Cub's next cast. "Who was that fellow that snapped you up so sassy?"

"I don't know," answered the professed castaway. "I've been trying to get help for more than a day, and he always breaks in and queers my call. He makes everybody think I'm putting up a prank."

"Where is your island?" asked Cub.

"Somewhere in the Thousand Islands. That's the best I can locate it. I've never been here before. Where are you?"

"At Oswego, New York."

"What's your call?"

"A V L."

"Can you do anything for me?"

"I don't know what I can do unless I try to interest somebody near you by wireless. I'll send out a broadcast in any manner you may suggest. But you can do that just as well as I."

"I have done it over and over, but it does not do any good," said "Crusoe". "That evil genius of mine always manages to queer me. Finally I got so desperate that I sent out an SOS."

"And committed a radio crime," broke in the alleged evil genius. "Don't you know the rules governing that distress signal?"

"There he is again," "Crusoe" dot-and-dashed.

"Who are you?" demanded Cub.

"I am Canadian amateur," was the reply. "That fellow who sent the distress signal is a Canadian college student trying to put over a college prank. I am on his trail to prevent him. We have a wager up; if he induces anybody to go to his rescue, I lose."

"That is not true," interposed the sender of the SOS.

"What is your call?" Cub inquired.

"Yes, give it to him, and tell him what college I am from," proposed the "fellow on the island".

"One of the conditions of our wager is that I must not reveal my identity," returned the anonymous amateur. "He's bound by like terms. He does not dare give you his name and address."

"That fellow is insane or a villain," declared "Crusoe". "I do not know who he is, but if I starve to death, he'll be a wanton murderer. My name is Raymond Flood. I am not a college student. I am a high school student at Kingston."

"Is his name Raymond Flood?" was Cub's next query intended for the anonymous amateur.

"No," was the latter's reply.

"What is it?"

"Under terms of our wager, I must not reveal his name and he must not reveal mine."

"Whew!" exclaimed Cub, addressing his two friends, who removed the phones from their ears, the better to hear him. "Can you beat that?"

"We sure have hit a sensation of some sort," Hal declared. "What'll we do?"

"I don't know what under the sun to do," Cub replied. "I don't like to pass him up, for fear he may be telling the truth; and yet, I don't like to be the victim of a joke."

"I tell you what to do," Bud suggested, without any seriousness of intent, however. "Make a dash over the lake in your father's motor boat and rescue this Robinson Crusoe."

"By Jiminie, Bud!" exclaimed Cub enthusiastically! "You've hit the nail on the head. Our vacation problem is solved. That's what we'll do, all of us. I don't care whether it's a joke or a tragedy; we'll make a voyage of discovery over that way and see if we can't find Crusoe's island. What say you, fellows?"

CHAPTER III

Talking It Over

What could the fellows say?

They couldn't say anything at first, so astonished were they at the announcement from Cub. Then so great was their eagerness, following the recovery from their astonishment that about all they could do was to "fall over each other" in their efforts to express their approval.

At last, however, the "panic of joy" subsided, and they began to sift out the obstacles that must naturally obtrude themselves in the way of such a scheme that involved such departure from the ordinary course of events.

"Do you think your father will let us go?" asked Hal somewhat apprehensively.

"We've taken trips alone before," Cub reminded.

"Yes, but only for short trips along the shore or up the canal," Hal replied. "Ontario's a rough lake, you know."

"Yes, but safe enough if you're used to it," Bud reasoned, coming to the aid of his lanky friend. "If necessary, we could follow the bend of the shore all the way and never get out of sight of land."

"That would make the trip longer and consequently take so much more time to get there," reasoned Cub.

"Time's precious in a case like this," Hal averred. "Remember that we must get up there in time to save a fellow with no food on hand from getting an empty stomach."

"How long would the trip take?" asked Bud.

"Well, let's see," said Cub, picking up a pencil and beginning to figure on a tab of paper before him. "The Catwhisker can make twelve miles an hour under favorable conditions. We could start early in the morning and reach the Thousand Islands surely by noon, and then have the rest of the day to hunt for Mr. Robinson Crusoe."

"It might be like hunting for a needle in a haystack," suggested Hal dubiously.

"Why shouldn't we be able to find him?" Cub demanded.

"It depends on how well Mr. Crusoe can describe his surroundings for us and how well we can follow directions," Hal argued.

"That's true enough," Cub admitted. "Let's see if I can get 'im again and what he can tell us."

He had no difficulty in picking up the "desperate Mr. Crusoe" again, for the latter proved to be "sparking" the ether with frantic calls in search of the radio boy on whom he believed he had made a serious impression, but who seemed, for some unhappy reason, to have forgotten him.

"I was just discussing your case with a couple of friends," Cub explained. "We thought we might make a run down your way in a motor boat if you could give us a clear idea where your island is located."

"I can't give you any latitude and longitude," was the "islander's" reply. "I was captured in my motor boat only a mile or two away from home. Then I was blindfolded and put here on this island by the rascals. It's a small wooded island surrounded by several other small wooded islands, making it impossible for me to hail passing boats. I will be glad to pay your expenses and enough more to make it worth your while if you will find me and get me away from here."

"I don't know how we'd find you without cruising among the Thousand Islands a week or two," returned Cub. "Have you a flag of distress flying?"

"It wouldn't do any good. Nobody would see it."

"Oh, I have an idea!" suddenly exclaimed Hal, for he and Bud had put their receivers back on their ears when Cub began to communicate with "Mr. Crusoe" once more.