Contents

CHAP.
I. [Man Overboard]
II. [Through the Fog]
III. [A Loss and a Find]
IV. [Arrested]
V. [A Discovery]
VI. [Von Wittelsbach's Plan]
VII. [Official Hindrances]
VIII. [Sentenced]
IX. [On the Scent]
X. [In the Prison Cell]
XI. [A Night of Toil]
XII. [Investigations]
XIII. [An Experiment with a Zeppelin]
XIV. [The Second Night of Liberty]
XV. [Recaptured]
XVI. [The News Leaks Out]
XVII. [The Sandinsel Tunnel]
XVIII. [The Errant Airship]
XIX. [At the Mercy of the Winds]
XX. [Homeward Bound]
XXI. [Good Old Hamerton!]
XXII. [A Momentous Decision]
XXIII. [First Blood]
XXIV. [The Battle of the Galloper Sands]
XXV. [The Fall of the Island Fortress]
Illustrations

["Hand over hand he climbed till he reached a metallic beam"]
Frontispiece

["Waiting till a wave brought the man within arm's length, the sub clutched hold of him"]

["'Spies are not entitled to any consideration of that description'"]

["'It's the rounds, by jove!' whispered the sub"]

["'Great scott!' he exclaimed; 'it's hamerton'"]

["A seaplane contrived to drop a bomb on the royal sovereign's deck"]