Contents
| CHAP. | |
| I. | [FLIRT'S INDISCRETION] |
| II. | [AN ULTIMATUM] |
| III. | [THE SUB'S STRATAGEM] |
| IV. | [BOUND FOR THE BALTIC] |
| V. | [THE STOWAWAY] |
| VI. | [THE ZEPPELIN HUNT] |
| VII. | [A DOUBLE BAG] |
| VIII. | ["ACCIDENTS WILL HAPPEN"] |
| IX. | [DRIFTING MINES] |
| X. | [THE "HAVORNEN'S" WARNING] |
| XI. | [CAUGHT IN THE NET] |
| XII. | ["AWAY DIVING-PARTY!"] |
| XIII. | [KAPITAN-LEUTNANT VON HOPPNER'S PROWESS] |
| XIV. | [THE WAY OUT] |
| XV. | [PICKING UP THE PILOT] |
| XVI. | [THE BATTLE OF MOON SOUND] |
| XVII. | [HIT] |
| XVIII. | [PINNED DOWN] |
| XIX. | [FORCED TO ASCEND] |
| XX. | [UNDER RUSSIAN ESCORT] |
| XXI. | [THE HOUSE IN BOBBINSKY PROSPEKT] |
| XXII. | [WHEN THE LIGHT FAILED] |
| XXIII. | [TRAPPED] |
| XXIV. | [FORDYCE'S TWO VISITORS] |
| XXV. | ["FLIRT, YOU'RE A BRICK!"] |
| XXVI. | [A FRIEND IN NEED] |
| XXVII. | [THE FATE OF KLOSTIVITCH] |
| XXVIII. | [RESCUED] |
| XXIX. | [THE CAPTURED CONVOY] |
| XXX. | [A DUEL TO THE DEATH] |
| XXXI. | [VON HOPPNER'S BOAST] |
| XXXII. | ["TAKEN DOWN A PEG"] |
| XXXIII. | [GOOD-BYE TO THE BALTIC] |
| XXXIV. | [HOME AGAIN] |