Mary Hilton, beautiful and discontented, falls in love with feckless charmer Jim Lancaster. Embarking on a passionate affair with him, she abandons her husband in favour of her lover, only to discover her feelings are not reciprocated. Wracked with jealousy of Jim's new lover, embittered as she becomes entangled in a web on complex relationships, Mary's mind falls to violent revenge. Condemned to death for her crime, Mary spends her days in prison subject to a strict routine, building relationships with the wardens who will become part of her final hours. Drifting from daydreams to reality, she awaits her fate at the hands of the legal system.