just had word, Professor, that your model of the torpedo has been
stolen from the Navy Department in Washington."

"Stolen?" repeated Kennedy, staring aghast.

"Yes. We fear that an agent of a foreign government has found a
traitor in the department."

Rapidly Kennedy's mind pictured what might be done with the deadly
weapon in the hands of an enemy.

"And," added the Secret Service man, "we have reason to believe
that this foreign agent is using a Chinaman, Wu Fang."

"But Wu has been arrested," replied Craig. "I arrested him myself.
The police have him now."

"Then you don't know of his escape?"

Kennedy could only stare as they told the story.

Suddenly, down the hall, came cries of, "Help! Help!"

. . . . . . .

While Craig was showing us the torpedo, the criminal machinery
which Wu had set in motion at orders from the foreign agents was
working rapidly.

Outside the Dodge house, a man had shadowed us. He waited until we