d. "Changed your clothes, eh?"

"I hope you didn't think we were going prowling about the street in our
British uniforms?" said Jack.

"Hardly. By any chance did you find weapons, too?"

Frank hesitated. For a moment he debated what was best to answer.
However, the odds were now three against one, so he replied:

"Yes; we have a gun apiece."

"Good; then we may as well be moving. The car should be here in ten
minutes at the latest. You see, that's why I was late. Had a blowout
aways back. We had to come in on foot. I sent my driver for another car
while I hurried here, for I was afraid that you might do something
rash. You see, I know more about you than you think I do."

"I wish you would tell us who you are, sir," said Jack.

"All in good time," replied the officer with a smile. "All in good
time."

Came a "honk-honk" from without.

"There's our car," said the officer quietly. "Come along."

Without a word the others followed him through the dark hall, out the
door and down the steps, where they climbed into the car, in the rear
seat, their captor taking his seat with the driver.

The automobile started immediately.

They rode along slowly for perhaps an hour; and they came to what the
lads recognized immediately as the water front. Their captor called a
halt and climbed out, motioning the lads to follow him. Immediately
they had alighted, the automobile drove away.

Straight down to the water their captor led the way. Jack whispered to
Frank.

"You can't tell me we are going to get away from here as easily as all
this."

"Sh-h-h!" was Frank's reply.

Jack thereafter maintained a discreet silence.

At the edge of the pier their captor pointed to a small rowboat in the
water.

"We'll get in here," he said.

They did so and a moment later they were being rowed across the water
by a man Frank recognized as a German sailor. The thing was becoming
more complicated.

A short distance ahead there now loomed up what appeared to be nothing
more than a motorboat of considerable size. The rowboat approached this
craft and the officer motioned his three companions to follow him
aboard. They did so.

Aboard, they saw that the vessel upon the deck of which they stood was
in reality a pleasure yacht, now converted into a vessel of war. A look
at her graceful outlines and long slender body told all three that the
vessel was built for speed.

Their captor had halted and waited for the three to come up wit