A voice from the strange car hailed Hal.

"Why do you stop us like this?" it demanded.

"Want to see who you are," was the lad's reply. "A spy has escaped
from Berlin, and I have orders to search all vehicles."

"You are mistaken," said the voice. "The spy has not escaped. We have
him here."

"Good!" exclaimed Hal. "Nevertheless, I must satisfy myself that you
are speaking the truth and are what you represent yourselves to be."

"Of course," returned the voice. "Approach."

Hal went forward slowly, gun in hand, as did McKenzie.

Hal now made out that there were four occupants of the car, besides the
man at the wheel and a figure stretched out in the tonneau.

With his cap down over his eyes, he peered in. The men were in
civilian garb and Hal knew, therefore, that they must be members of the
secret service and not of the military. He knew, too, that they would
consequently be that much harder to handle. Nevertheless, he
determined upon a bold stroke.

"Hands up, all of you I" he cried in a stern voice.

His revolver covered the occupants in the front seat. McKenzie covered
the rear.