Bloody Murder (1974)

Original title: ...La Main à couper

Hélène, an antique dealer and her husband Georges, a respected doctor, live in a beautiful property and gives everyone the image of conjugal happiness. The children, Daniel and Nadine, are busy with their studies and their loves. The bourgeois life of Hélène is troubled by the murder of her lover, Philippe, a friend of her son. She finds the body when she goes to one of their appointments. In shock, she still thinks to take away the address book of the victim where her name appears - object compromising for her marriage. The police are interested in her. A stranger blackmails her. She is caught in a gear that she can not get out of. She then suspects that all is a revenge from her husband.