Minou is a wealthy housewife, who yearns for the attention of her husband Peter. However, Peter is frequently busy at work and is rarely at home. Minou is out one night when she is attacked by a strange man, who cuts open her clothes and warns her that her husband is a killer.
Minou ignores what she has been told until she finds that a man indebted to Peter has been found dead. She receives a telephone call from her attacker, who plays a tape recording of Peter discussing the murders. The attacker tells Minou that he will go public with this evidence if she does not come to his house; when she is there he further blackmails her into sleeping with him. However, he has used a hidden camera to photograph the tryst, and continues to use this new leverage to continue blackmailing her.
Dominique, a friend of Minou, initially seems to be trustworthy, but Minou finds pornographic photographs of her blackmailer in Dominique's possession. When Minou leads the police to her blackmailer's home, it has been emptied of all belongings; while Dominique refuses to corroborate that the man even existed. Doubt begins to amass as to Minou's sanity, leading to her suffering a nervous breakdown and taking an overdose of tranquilizers.
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