the doorway of the workshop in his father's
back yard, where the Camp Brady Wireless Club made their headquarters.
He was reading the morning newspaper. Suddenly he sprang to his feet.
His face grew black. His free hand clenched.

"That's terrible!" he exclaimed. "Terrible!"

He walked across the shop, spread the newspaper on the bench and began
to read aloud the big head-lines that had so aroused him.

LEAK IN NAVY DEPARTMENT

_Germans Knew of Departure of Transport Fleet_
_First Contingent of Pershing's Men Attacked, by Waiting
Submarines_

"It's terrible, terrible!" repeated Henry. "Their spies are
everywhere. They stop at nothing. Who could have been villain enough
to give them the information? It is terrible!"

In his agitation Henry began to pace up and down the floor of the shop.
His face grew blacker and blacker as he brooded over the story of
treachery. Though Henry was not yet eighteen, he was affected far more
deeply by the story than most boys of his age would have been. For
when the Camp Brady Wireless Club, of which Henry was president, had
been practising the previous summer, Henry had been called upon to
replace one of Uncle Sam's radio men who was suddenly stricken with
appendicitis, and Henry had taken the operator's oath of fidelity to
his government. So to him treachery appeared doubly black.

For some moments he paced up and down the shop. Suddenly he stopped
short. A new idea had come to him.

"How did they get the news to Germany?" he asked aloud. "Both the
cables and the mails are censored--and besides the mails would be too
slow. It must have been the wireless. Can there be traitors in the
wireless service, too?"

Henry was silent a moment, his brow wrinkled in thought. "Never!" he
cried suddenly. "Uncle Sam's radio men are true blue. It's a secret
wireless! A secret wireless! The Germans have got a hidden station
somewhere."

The black look left his face. The scowl was replaced by a gleam of
joy. "That means a job for us!" he cried. "The wireless patrol can
help find that station, just as we found the German dynamiters at Elk
City."

For when the wireless patrol had been at Camp Brady only a few weeks
previously, acting as official operators for the commander of the
troops guarding that section of the country, Roy Mercer had picked an
innocent-looking message out of the air one night and by accident had
found a code message in it revealing a Germa