Chabrol's film begins with a long tracking shot through the window of a café, picking up Sophie (Sandrine Bonnaire) as she walks toward her appointment with Catherine Lelièvre (Jacqueline Bisset). Catherine is as chic as Sophie, boyishly dressed with her hair cut in too-short bangs, is drab. The Lelièvres need a housekeeper, Catherine tells her, and Sophie presents the letter of reference from her most recent employer. The interview is slightly awkward, partly because Sophie is oddly oblique in her answers. But Catherine has a large house in a remote location and she needs a housekeeper right away. When Catherine drives Sophie to the house, a young woman named Jeanne (Isabelle Huppert) appears and hitches a ride to the village near the Lelièvres house; Jeanne, who is as brashly forward as Sophie is reserved, works in the village post office. At the house, Sophie meets Catherine's husband, Georges (Jean-Pierre Cassel), a rather blustery businessman, and her son from a previous marriage, the teenage Gilles (Valentin Merlet), and stepdaughter, a university student named Melinda (Virginie Ledoyen). Sophie proves to be an excellent cook and a reliable maid-of-all-work, but we soon discover that she has a secret or two. One is that she's illiterate, the result of a profound dyslexia. She doesn't drive, being unable to pass a driving test, and pretends that she needs glasses. When Georges insists on taking her to an optometrist, she ducks out of the appointment and buys a cheap pair of drugstore glasses -- though even then she is unable to give the sales clerk the exact change. Waiting for Georges, she meets Jeanne again, and the two women strike up a friendship. Jeanne, it turns out, knows another secret of Sophie's, which is that she was accused of setting fire to her house, killing her disabled father. Jeanne herself was accused of abusing her daughter, born out of wedlock, and causing her death, but both women were acquitted for lack of evidence. And so the stage is set for a story of folie à deux that Chabrol adapts from a novel, A Judgment in Stone, by Ruth Rendell. Bonnaire and Huppert are extraordinary in their contrasting styles: Bonnaire passive, almost autistic in manner, Huppert bold and outgoing. The climax, in which a frenzied Jeanne releases Sophie's pent-up hostility, is shattering.