| I. | The Man in the Next Compartment | 9 |
| II. | In the Emperor’s Gardens | 20 |
| III. | War Talk | 48 |
| IV. | Stirring Up Trouble | 67 |
| V. | Who Wrote the Letter? | 89 |
| VI. | Bill Marley’s Fist | 117 |
| VII. | The Secret Document | 137 |
| VIII. | Misunderstanding | 156 |
| IX. | More Discoveries | 176 |
| X. | Captain Inaba | 191 |
| XI. | Phil Confesses | 208 |
| XII. | The Conspirators | 224 |
| XIII. | The Quarrel | 235 |
| XIV. | The Yacht “Sylvia” | 249 |
| XV. | International Diplomacy | 258 |
| XVI. | The Duel | 274 |
| XVII. | Indecision | 289 |
| XVIII. | A Bold Plan | 306 |
| XIX. | On the High Seas | 321 |
| XX. | The “Hatsuke” | 336 |
| XXI. | The Japanese Fleet | 352 |
| XXII. | Plot and Counterplot | 369 |
| XXIII. | By Wireless | 384 |