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Shopkeeper Theo (Peter McEnery) and his live-in lover, Vivien (Glenda Jackson), ease their weariness with one another by pretending to be characters from the famous Dr. Crippen murder case during lovemaking. When gorgeous bisexual photographer Reingard (Diane Cilento) sees them in the act, she takes up residence in the next room and begins photographing them during sex. As Reingard becomes further enmeshed in the threesome, she pushes Theo into a fantasy that may have dire consequences. Wikipedia