The servant glanced at him sharply, then leaned close.

"Are you the messenger Herr Robard expects?" he asked, in a low voice.

Hal glanced sharply about him, more for effect than anything else, and
replied, speaking softly:

"From the Wilhelmstrasse."

"Good," said the man, nodding his pleasure. "I am instructed to tell you
to come back at a little before ten o'clock."

"Will Herr Robard be here then?"

"Possibly not, but you can wait."

"I shall be here," said Hal, and walked down the steps.

He rejoined Chester and Uncle John, who had waited around the corner.

"I was beginning to fear something had happened to you," said Uncle John.

"What luck?" demanded Chester.

"Better than could be expected," said Hal, and repeated the conversation
with the servant.

"And who do you suppose this messenger is?" asked Chester.

"A German secret agent," replied Hal decidedly.