Contents

I.[UNDER THE SEA.]
II.[THE D-16.]
III.[THE ENGAGEMENT.]
IV.[A DARING PLAN.]
V.[TROUBLE ON BOARD.]
VI.[THE SPY.]
VII.[DEATH OF THE SPY.]
VIII.[HELIGOLAND.]
IX.[A DESPERATE VENTURE.]
X.[IN THE KIEL CANAL.]
XI.[AT CLOSE QUARTERS.]
XII.[CAPTURED.]
XIII.[A SUBMARINE RAID.]
XIV.[THE ESCAPE.]
XV.[INTO THE BALTIC.]
XVI.[IN TROUBLE AGAIN.]
XVII.[PETROGRAD.]
XVIII.[A PLOT.]
XIX.[THE PLOTTERS FOILED.]
XX.[BOUND WESTWARD AGAIN.]
XXI.[A NEUTRALITY VIOLATION.]
XXII.[IN THE MEDITERRANEAN.]
XXIII.[THE CHASE.]
XXIV.[OFF FOR THE DARDANELLES.]
XXV.[IN THE DARDANELLES.]
XXVI.[SCOUTING.]
XXVII.[A DESPERATE UNDERTAKING.]
XXVIII.[A CAPTURE.]
XXIX.[THE LAST SHOT OF THE D-16.]

THE BOY ALLIES WITH THE TERROR OF THE SEAS.

CHAPTER I.
UNDER THE SEA.

“One!”

The speaker was Jack Templeton, an English youth and first officer of the British submarine D-16, Lord Hastings, commander.

Frank Chadwick, an American lad about the same age as Jack, the second officer of the under-sea fighter, laid his hand upon his friend’s arm.

“Let me take a look,” he said.