Barney Thompson is a small barber who is the laughing stock of his colleagues and clients in Glasgow. The latter swallows up his anger every day dreaming of a world in which none of his bullies would exist. By a series of fortuitous incidents, his fantasies will become reality while Barney will quietly plunge into the world of serial murder. As he tries to hide his tracks, Inspector Holdall tries to solve the murder of the century. Errors multiply from one side to the other as the police attempts to capture the murderer.