Solicitor Alan Phipps plans to blackmail wife Yvonne, frame her lover John Brodie as the blackmailer, and manipulate Yvonne into killing Brodie, seeking revenge on both for their affair.
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.