INTRODUCTION CHAPTER I. THE WAR TERROR CHAPTER II. THE ELECTRO-MAGNETIC GUN CHAPTER III. THE MURDER SYNDICATE CHAPTER IV. THE AIR PIRATE CHAPTER V. THE ULTRA-VIOLET RAY CHAPTER VI. THE TRIPLE MIRROR CHAPTER VII. THE WIRELESS WIRETAPPERS CHAPTER VIII. THE HOUSEBOAT MYSTERY CHAPTER IX. THE RADIO DETECTIVE CHAPTER X. THE CURIO SHOP CHAPTER XI. THE “PILLAR OF DEATH” CHAPTER XII. THE ARROW POISON CHAPTER XIII. THE RADIUM ROBBER CHAPTER XIV. THE SPINTHARISCOPE CHAPTER XV. THE ASPHYXIATING SAFE CHAPTER XVI. THE DEAD LINE CHAPTER XVII. THE PASTE REPLICA CHAPTER XVIII. THE BURGLAR’S MICROPHONE CHAPTER XIX. THE GERM LETTER CHAPTER XX. THE ARTIFICIAL KIDNEY CHAPTER XXI. THE POISON …
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