In the village of Chelton, just outside Fulchester, an elderly man is knocked off his bicycle and killed by a speeding green Mercedes convertible. The car is traced to a local wealthy businessman who now needs to explain why the car in question was taken to a local garage for repairs within hours of the incident. The accused denies causing death by dangerous driving. His defense counsel are claiming that the policeman dealing with the case held a grudge against the accused ever since a previous attempt to prosecute him on another matter proved unsuccessful.

Forensic scientist Dr. Angus Roberts confirms the paint specs, at the crash, came from a Mercedes 350SL. Henry Burnett gives evidence and denies his car knocked over the cyclist. The prosecution claim he pressured people to lie for him.

Henry Burnett's private secretary Vera Emberton gives her employer, an alibi, for the time of the accident while director Robert Danville claims the car was damaged earlier. However Mrs Emberton's husband breaks down under questioning.