CONTENTS
| CHAPTER | |
| I. | [The Two Sub-Lieutenants] |
| II. | [On Patrol] |
| III. | [Sunk in Action] |
| IV. | [The Spy] |
| V. | [The Prowess of Kapitan von Preugfeld] |
| VI. | [Picked Up] |
| VII. | [A U-Boat of Sorts] |
| VIII. | [Von Preussen's Blank Day] |
| IX. | [How the Lighters Fared] |
| X. | [The Salvage Syndicate] |
| XI. | [Von Preugfeld's Resolve] |
| XII. | [Prisoners of War] |
| XIII. | [A Struggle for Life] |
| XIV. | [A Double Decoy] |
| XV. | [Confirmed Suspicions] |
| XVI. | [Covering His Tracks] |
| XVII. | [Mutiny] |
| XVIII. | [A Big Proposition] |
| XIX. | [The Tables Turned] |
| XX. | [The End of U 247] |
| XXI. | [Bluffed] |
| XXII. | [On the Trail] |
| XXIII. | ["Prepare for Immediate Action"] |
| XXIV. | [In the Hour of His Triumph] |
| XXV. | [Trapped] |
| XXVI. | [Her Last Bolt] |
| XXVII. | [Battered but Undaunted] |
| XXVIII. | [The Homecoming] |
| XXIX. | [Who Fired that Torpedo?] |
| XXX. | [A Night of Coincidences] |
| XXXI. | [The Great Surrender] |
| XXXII. | [A Navy Impotent] |
| XXXIII. | [The Relief Vessel] |
| XXXIV. | [The Scuttling] |
| XXXV. | [What They Fought For] |