caused the fellow to flush red.

"You're no good--savvy?" insisted Runkle in a low tone, making more
faces and gestures.

So quickly was it done that the now thoroughly insulted spy, though he
did not understand English, leaped at Runkle in a rage.

"He's going to try to rob me, sir!" cried Runkle, not very effectively
dodging the blows that the fellow aimed at him.

"Here, what are you up to?" demanded Totten, also in English, as he
reached out to grab the spy's collar.

In that strong grip the spy writhed, but could not escape.

"Thank you, sir," cried Runkle, with an unmistakable wink, after which
he raced for the car and the compartment in which the two young
ensigns waited.

"Lieutenant Totten is holding on to the chap, sir," announced Runkle
gleefully. "He won't let him go until the train's out, either."

Holding the unlocked door open a crack, Dan Dalzell watched as the
train pulled away from the station.

"Totten has him, and is explaining to a policeman," Dalzell chuckled.
"That spy doesn't travel with us this trip."

"What's the odds?" asked Darrin, after a pause. "Dalny must belong to
a big and clever organization. He can wire ahead to spies who will
board the train later on and follow us into Paris."

"Then, with your leave, sir, I'll keep my eye open for spies until
we're back aboard the flagship," suggested Runkle.

"Very good, so long as you break neither laws nor bones, Runkle," Dave
laughed.

The Americans had the compartment to themselves. Had all been in
uniform Runkle would not have been likely to travel in the same
compartment with the young officers, but in citizen's dress much of
discipline could be waived for greater safety.

Though Dan Dalzell did not now have much hope of sight-seeing in
Paris, he was able, after dozing until daylight, to gaze interestedly
out upon the country through which he was traveling.

Able Seaman Runkle was another absorbed window-gazer. As for Ensign
Dave Darrin, while he caught many interesting glimpses of the scenery,
his mind was mainly on the question of how the international plotters
were planning to break the friendship between the two strongest
nations on earth.

By what means could these plotters sink a British ship, and yet make
it appear to be the work of Americans?

Hundreds of miles had been traveled, and one day had swung far on into
another before a plausible answer came to Darrin's mind.

Then Dave fairly jumped--the thing that Ad