Thérèse is living in a provincial town, unhappily married to Bernard, a dull, pompous man whose only interest is preserving his family name and property. They live in an isolated country mansion surrounded by servants. Early in her marriage her only comforts are her fondness for Bernard's pine-tree forest, which was her primary reason for marrying him, and her love for her sister-in-law and Bernard's half-sister, Anne. The movie recounts in flashback the circumstances that led to her being charged with poisoning her husband.

Seven directors each dramatize one of the seven deadly sins in a short film. In "Anger," a domestic argument over a fly in the Sunday soup escalates into nuclear war. In "Sloth," a movie star would rather pay someone to tie his shoe than bend over to do it himself, and he can't be bothered to accept a starlet's sexual favors. In "Gluttony," a peasant family on its way to the funeral of a relative who died from indigestion stops regularly to eat and drink en route, arriving in time to eat some more. In "Greed," a high-class prostitute refunds the price of a cadet's lottery ticket. In "Pride," an unfaithful wife finds reason to reform. And so on through lust and envy.