t toward the sound.

Almost before he finished, the sound grew louder and Henry knew the car
was advancing. He shrank back into the thicket, dragging his
motor-cycle with him. An instant later the roadster rolled softly
past, not more than fifty feet distant. In a moment more the car had
reached the fence and turned into the highway. Its lights suddenly
flashed out and the car went bowling down the road toward Brooklyn.

Henry leaped from the thicket and ran toward the highway, pushing his
motor-cycle before him. He paused at the opening in the fence, and
with his knife smoothed a space on one of the posts and marked a cross
on it with his pencil. Then he ran to the highway, started his motor,
and was soon flying down the road in pursuit of the roadster. And as
he had come, so he returned, with lights out, until Brooklyn was
reached and the streets were once more alive with traffic.

At a safe distance he followed the unsuspecting motorist and saw him
turn into a private yard in Flatbush. Instantly Henry dismounted,
thrust his wheel behind a hedge that fenced a private residence, and
gained a position where he could watch the spy's house. He saw the spy
close and lock his garage and enter the house. Stealthily Henry
approached and noted the house number. At the corner he got the name
of the street. Then he hurried back to his hidden motor-cycle and was
soon flying back to his comrades at the eagle's nest.

CHAPTER XI

AN UNSUCCESSFUL SEARCH

It was characteristic of Henry that he should tell the worst about
himself first. In his own manly way he was willing to accept the blame
for his failure.

"He got away from me," he began, so chagrined that he could hardly
repress the tears. "I didn't find the hidden wireless and I have
failed in my task."

Before his captain he stood with downcast eyes and tortured heart. His
experience at Camp Brady had taught him that the wireless patrol
expected every member to do his duty--and he had failed.

Captain Hardy looked at his lieutenant for a moment without answering.
He had not the slightest idea of what had occurred, but he recognized
instantly the manliness of Henry's report. The latter was offering no
excuses, making no attempt to shield himself from the consequences of
his failure.

"Suppose you tell us just what happened," said the leader gently, "and
we can judge better how badly you have failed."

Gratefully Henry looked up. He had not exp