Françoise lives in a manor but is not happy. Georges, her husband, is gentle to her but she feels stifled by the constant presence of Cécile, her intrusive mother-in-law. One day, Laurentin, a friend of George's comes to visit him. He is in the company of a beautiful woman, Marie-Hélène. Françoise, who feels ill-at-ease in her new environment, gets more and more attracted to Marie-Hélène. To such an extent that the two women fall in love. The lovers run away to the city but their affair will prove short-lived.