| I | | "For Uncle Sam" | 9 | | II | | Into the Service—A Spy | 21 | | III | | Unexpected Action | 34 | | IV | | Farewell, United States | 43 | | V | | The Fight in the Wireless Room | 54 | | VI | | The Mystery of the Iron Cross | 67 | | VII | | The Timely Rescue | 77 | | VIII | | The Death of the Spy | 88 | | IX | | The Periscope at Dawn | 101 | | X | | France at Last | 110 | | XI | | Tapping the Enemy's Wire | 118 | | XII | | The S O S With Pistol Shots | 131 | | XIII | | The Cave of Death | 140 | | XIV | | DESPERATE MEASURES | 153 | | XV | | The Surprise Attack—Promotion | 164 | | XVI | | A Tight Place | 176 | | XVII | | The Lieutenant's Invention | 191 | | XVIII | | Slim Goodwin a Prisoner | 200 | | XIX | | Turning the Tables | 211 | | XX | | The Great News | 221 |
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