Recently-qualified Dr Roy Cartwright takes a temporary post as a locum in an established London practice. Soon, he is falsely accused of the attempted rape of a middle-aged female patient - and the practice receptionist, Lilian, warns him that the same thing happened to Dr Markson. Now, Dr Markson is reported to be on holiday; but his body is found in Southampton Water. Dr Cartwright becomes dragged into corruption and he is lucky that his uncle has friends in Scotland Yard who can try to help him. He also has a friend in Lilian . . .