Author of “The Deep Sea Hunters,” “Isles of Spice and Palm,” “The Book of the Motor Boat,” etc. CHAPTER I—TOM TAKES UP RADIO CHAPTER II—MYSTERIOUS MESSAGES CHAPTER III—THE RADIO DETECTIVES CHAPTER IV—THE BOYS DRAW A BLANK CHAPTER V—THE UNDER-SEA WIRELESS CHAPTER VI—THE RED MENACE CHAPTER VII—THE CRY FROM THE DEPTHS CHAPTER VIII—ASTOUNDING DISCOVERIES CHAPTER IX—THE BATTLE BENEATH THE RIVER CHAPTER X—RADIO WINS CHAPTER XI—HENDERSON HAS AN INTERVIEW CHAPTER XII—THE CONFESSION CHAPTER XIII—RAWLINS’ PROPOSAL…
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