单项选择题

The big red American car was much too wide for an English country road. When Paul Carson saw it coming towards him he stopped his own car at the side, to make room for it to pass. The big car went slowly past, so close that Paul could see its driver’s face quite clearly. It was not a pretty face. The mouth was cut very short, and the eyes were hidden behind dark glasses.
"Where have I seen that face before" Paul wondered, "Wait a minute. I remember now. It was in the newspaper." He turned to his sister. "Have you still got yesterday’s paper, Nora" Nora found the paper from the back of the car. Paul turned quickly to the middle page and showed her the picture. It was not a pretty face. It had a large mouth and small ears, and its eyes were hidden behind dark glasses.
"’Wanted by the police, ’" read Paul, "’for paying bills with useless cheques at hotels and shops in Margate, Brighton and other large seaside towns. The City Bank will pay fifty pounds to anyone who helps the police to catch this man.’"
"That’s true. What are you going to do, Paul Call the police"
"No. I want to make sure first." He turned the car and began to drive back the same way. "Let’s follow him and watch for a few minutes. What’s his car number Where is he staying To get our fifty pounds, we must be able to tell the police as much as possible."
Soon they saw the red car in front of them. It seemed to be going very slowly.
After reading the newspaper, Nora and Paul thought ______.