of the German secret service.

Hal looked carefully about the room. A long table stood in the
center. This apparently was the personal property of General Rentzel.
Great easy chairs were scattered about the room. There was a window at
the south side, and back, in the center, against the wall, was a large
safe.

"Pretty comfortable place," said Hal aloud.

"Rather," agreed the young German. "Father believes in making himself
comfortable."

General Rentzel had not arrived yet, but he put in an appearance a few
moments later. He manifested no surprise at sight of his son, but he
eyed Hal askance.

"I thought you young fellows had gone to look about the city," he
said.

"No, sir," replied his son. "I invited. Herr Block here to see you,
sir."

"You did? Why?"

The son explained as quickly as. possible.

"Hm-m," muttered the general when his son had concluded, eying Hal
sharply. "How do I know you are what you represent yourself to be,
sir?" he demanded.