In England, the Italian English hairdresser Milo Tindle is invited by the successful writer of detective stories Andrew Wyke to visit his isolated house. The lower class Milo is the lover of Andrew's wife, who is used to have a comfortable life, and he intends to marry her. Andrew proposes Milo to steal his jewelry simulating a burglary. Milo would make a fortune selling the jewels to an intermediary; and Andrew would be reimbursed by the insurance company and would not pay alimony. However, the whole situation was part of an evil game. When Milo vanishes, a detective visits Andrew to investigate what really happened that night, when deadly games are disclosed.