It was the day before they were actually to enter the danger zone--the
zone marked off in her arrogance by Germany--that something occurred
which made even cautious Blake think that perhaps they were justified in
their suspicions of the Frenchman.

The usual lifeboat drills had been held, and the passengers were
standing about in small groups, talking of what was best to be done in
case the torpedo or submarine alarm should be given, when Macaroni, who
had been down in the cabin, came up and crossed the deck to where Blake
and Joe were talking to two young ladies, to whom they had been
introduced by the captain.

By one of the many signs in use among moving picture camera men, which
take the place of words when they are busy at the films, Macaroni gave
the two chums to understand he wanted to speak to them privately and at
once. The two partners remained a little longer in conversation, and
then, making their excuses, followed their helper to a secluded spot.

"What's up?" demanded Joe. "Have you made some views of a torpedo?"

"Or seen a periscope?" asked Blake.

"Neither one," Charlie answered. "But if you want to see something that
will open your eyes come below."

His manner was so earnest and strange, and he seemed so moved by what he
had evidently seen, that Blake and Joe, asking no further questions,
followed him.

"What is it?" Joe demanded, as they were about to enter their cabin, one