Bob strained his eyes, but the darkness in the middle of the block was intense. Perhaps, after all, that was a blessing for it gave them a better opportunity to hide and made the task of the searchers all the harder.

Impatient and cramped from hiding behind the pile of bricks, Bob moved away. He was determined to escape from the trap into which they had fallen and he decided that by working his way back along the street toward the car which had been used by their pursuers might offer the best avenue of escape.

A bold thought occurred. It might even be possible to seize their car and make his own escape.

Bob, crouching low, crept along the street, at times almost crawling. It wasn’t a pleasant task, but he was steadily putting distance between himself and the stalled taxi, where he knew the hunt for his uncle and himself was being concentrated.

The young federal agent stumbled over a timber and sprawled headlong on the dirt.

To Bob it sounded as though the noise of his fall must have echoed and re-echoed along the street. He remained motionless, almost breathless on the ground, waiting for the pursuit to swing toward him. But evidently the noise of his tumble was not as great as he had feared and the hunt continued near the taxi.

Bob continued his cautious advance toward the car which had brought their pursuers. He was not certain whether anyone had been left to guard the machine and he moved carefully as he neared the vehicle.

He was now at least 200 feet from the stalled taxi, and he had no desire to give an alarm which would bring the others swarming toward him.

Bob now had decided what he would do when he reached the car. In turning it about he would race the engine, which would be sure to attract the attention of the men seeking his uncle and allow him to escape from the far end of the street. There should be ample time for Bob to maneuver the car about and get it started back down the street before he could be overhauled.

The young federal agent was less than twenty feet from the car, close enough to hear the soft purring of its powerful engine, when a gun blazed from behind him and the echoes of a shot resounded between the buildings which flanked the street.