"A pretty ticklish piece of business," said Chester quietly, as they
made their way to their own quarters.

"Rather," said Hal dryly; "and still it must be done. The safety of
America depends upon the success of our mission. It may be well that
it has been entrusted to us rather than to older men. We are less
likely to be suspected if we reach Berlin safely. Besides, we have
been there before, and are somewhat familiar with the city."

"Yes," said Chester grimly, "we've been there several times before. I
recall that we went there once very much against our will --
prisoners."

"Well, we didn't stay very long," said Hal.

"Let's hope we don't stay for keeps this time either," said Chester.
"To tell the truth, I don't think much of this spy business myself."

"Somebody has to do it," Hal declared.

"Of course, but I am not very fond of that sort of work."

"If you don't want to go -" Hal began, but Chester interrupted.

"Of course, I want to go if it must be. I am ready to do what I can
for my country in whatever way I may."

"I knew it," said Hal; "I was only fooling. Come, we will acquaint
McKenzie with his work. And if he comes safely through this, I feel