Luc Bondy

Witold narrates a story. In Warsaw, in 1943, he meets the cultivated Fryderyk at a salon and they become friends. He takes Fryderyk with him to the country estate of Hipolit, Maria, and Henia, their teen daughter. Hipolit aids local resistance fighters. Fryderyk embarks on a game to engineer the cuckolding of Waclaw, Henia's fiancé, by Karol, a youth in the household who's Henia's long-time friend... (imdb)

Dorante (Garrel) is a tenebrous and financially ruined young man who has the good fortune to become the private secretary of the fair-haired Araminte (Huppert), a rich widow. The latter is destined by her imperious mother, Madame Argan (Ogier), to marry the Count Dorimont to avoid entering a protracted legal battle with the Count over a piece of land. (hollywoodreporter.com)

A promising young pianist commits suicide. He spent his last evening in the company of the industrialist Friedrich Hofreiter. His wife Genia is in possession of a farewell note. (imdb)