cret Service men had already
learned---that his name was really spelled B-r-a-u-n; that both
he and his father were German subjects, and that the young man
had enlisted for the sole purpose of playing the spy and the plotter
in the Army.

It had been Mock's talk of deserting in France that had caused Braun
to talk to Mock, who had been told by Captain Prescott to talk in
that vein while in the bull-pen. Braun had fallen into the trap.

As for Wilhelm---which wasn't the young an's real name---he was
the son of a German-born father, but a young man of known loyalty
to the United States. He wasn't a soldier, but a War Department
agent who had donned the uniform for a purpose, and had come to
Camp Berry with a draft of real soldiers.

And this was the plan that Dick had worked out following his pretended
arrest of Mock that night up the road. Mock, resolved to become
a good soldier again, had undergone his humiliation in the bull-pen,
and the scorn of his fellow-prisoners, in order to trap the
stoop-shouldered German, a pretended carpenter, but really August
Biederfeld, a German spy. The bespectacled one, Dr. Carl Ebers,
was another spy. The two had delivered their messages in camp
through Braun.

While the pair Ebers and Biederfeld were interned, Braun, as one
who had enlisted in the Army and had taken the oath of service,
was court-martialed on a charge of high treason, and shot for
his crimes. Before his death he confessed that it was he who
had shaken the powdered glass in the food of F company, the stuff
having been supplied by Dr. Ebers. It was Braun, also, who had
damaged the machine gun and worked havoc with infantry rifles,
he, too, had forged and placed the pretended Prescott note about
"Cooking Cartwright's goose."

"Wilhelm" soon vanished, undoubtedly to do other work as an alleged
German sympathizer elsewhere. As for Mock:

"Private James Mock, B company, having suffered humiliation and
scorn that he might better fulfil his oath and serve his country,
is hereby restored to his former rank of sergeant in B company,
and with full honor, he will be obeyed and respected accordingly."

So ran the official order published to the regiment.

The liquid in the two vials was found to be swarming with measles
germs that would have started a veritable epidemic at Camp Berry.

Captain Dick Prescott's quick thinking and steady action had resulted
in the capture of the German spies who were seeking to dest