XXI. Trapped
XXII. Yankee Ingenuity
XXIII. Out of the Net
XXIV. Into Zeebrugge
XXV. Chlorine Gas
XXVI. The Stars and Stripes




CHAPTER I

GOOD-BY, BRIGHTON


"Wanted: young men to enlist in Uncle Sam's submarine fleet for service
in European waters."

The magic words stood out in bold type from the newspaper that Jack
Hammond held spread out over his knees. Underneath the caption ran
a detailed statement setting forth the desire of the United States
Government to recruit at once a great force of young Americans to man
the undersea ships that were to be sent abroad for service against
Germany.

Stirred by the appeal, Jack snatched the paper closer and read every
word of the advertisement, his eyes dancing with interest.

"Your country needs you _now_!" it ran; and further on: