London 1933. Amory Ames and her husband Milo encounter their old friend Gerard Holloway in the bustling streets of London’s West End. He invites them to the dress rehearsal of a new play he is directing but he has a further request: he needs their help to discover who has been sending his leading lady and mistress - Flora Bell threatening letters.

Torn between her loyalty to Gerard's wife and the thrill of a mystery Amory grudgingly accepts the request. She and Milo that many cast members have a reason to resent Flora. With an assembled group so skilled in the art of deception and the scene set for murder can they unmask a killer before the final curtain falls?