When flatmates Bridget and Diane decide to look for another tenant, Norah applies for the room. She says she ia a battered wife and has run away from home. Gradually, however, her lies are revealed. She is not a battered wife but the mother of a mentally ill son and wife of a psychiatrist. Her husband thinks her son is a genius and blames all his problems on Norah's smothering love, saying that she is the one who needs help. Unable to cope any more, Norah has fled, putting them all in mortal danger...