 Solicitor Alan Phipps formulates a plan to blackmail his wealthy and unfaithful wife, Yvonne, and at the same time, get revenge against her boyfriend, John Brodie, by setting him up to appear that he is the blackmailer and for Yvonne to kill him. But Brodie, anticipating this predictament, has a hidden agenda behind all this to get the last laugh at Phipps.