He had started out the most unsuspecting of men, and now he was making up for it by suspecting Foster and Mert of being robbers and hypocrites and potential murderers.

He could readily imagine them shooting him in the back of the head while he drove, if that would suit their purpose, or if they thought that he suspected them.
He kept reviewing his performance in that garage.

Had he really intended to steal the car, he would not have had the nerve to take the chances he had taken.

He shivered when he recalled how he had slid under the car when the owner came in.

What if the man had seen him or heard him?
He would be in jail now, instead of splashing along the highway many miles to the south.