Outside Hal found the automobile which had brought them to the ball.
He leaped in and McKenzie followed. Hal gave quick directions to the
chauffeur to drive them home. The latter asked no questions.

At the home of Mrs. Schweiring Hal ordered McKenzie to remain in the
car while the lad hurried into the house. He returned a moment later,
carrying a small grip. This he threw into the car and climbed in after
it.

"We have important business with General Rentzel," he told the
chauffeur. "You will drive us there and then return to the ball for
your mistress."

The chauffeur asked no questions. There were so many queer things
going on in Berlin that he was not even greatly interested.

General Rentzel's office was in darkness when the car pulled up before
it. Motioning McKenzie to follow him, Hal hastened up the steps. The
chauffeur, in accordance with Hal's instructions, immediately
disappeared down the street with the car.

In the darkness of the vestibule, Hal tried the door.

"Locked," he said. "Lucky we came prepared."

He opened the little grip he carried.

Meanwhile, Chester had carried Hal's message to Gladys. The latter had
repeated it to her mother, and these two now shadowed General Rentzel