General Rentzel glanced at his watch.

"Half-past eleven," he said.

"Surely, it is not that late," said Mrs. Schweiring. "Why, we have
only been here a short time."

"Madame," said General Rentzel at this juncture, "I must ask you to
excuse me. I must be going."

There was no reply the other could make to this without laying herself
open to suspicion. She stepped back, and the German secret service
chief passed on.

Behind him the woman and her daughter wrung their hands. They had been
unsuccessful. In their minds they could see General Rentzel bursting
in upon Hal and McKenzie in the middle of their work.

"What are we going to do?" cried the mother.

"They must be warned!' cried the daughter.

"But how?"

"I will warn them myself. It is a long ways to the general's
quarters. He will be in no hurry. I can get there ahead of him."

"But if you should be discovered?"

Gladys shrugged her shoulders and was gone before her mother could