In Paris, unhappy movie actress Catherine Crachat becomes infatuated with the mathematician Pierre Indemini, but then breaks up with him. After a film shoot in Vienna, Catherine stays with a rich admirer, Fanny Hohenstein. Fanny has a history of many lovers of both sexes, two of whom killed themselves over her.
An adolescent comes of age during a summer in the Rhône valley with his maternal grandparents. Jules seems a little too close to his mother and distant from his father, who wants Jules out of their Parisian house. It's to be a summer of transition, perhaps to a boarding school, and during these weeks in the country, Jules fishes with his grandfather; proves himself to the local youths, a group led by the bullying Red; takes on some tough guys; feels rejected by his mother; and, meets and pursues Evelyne, the village beauty. She's responsive, and Jules doesn't exactly know what to do next. Then, something happens that propels Jules into decisiveness and maturity.
Marie has always been somewhat independent and is considered by some to be a bit of a tomboy. Though she is not quite a teenager, her photographer father has no qualms about leaving her alone for a while when he has to go off on an assignment. One day, while she is walking along, she gets run down by an automobile. The contrite woman driving that car sees to it that she is all right, and before long the two of them have become fast friends. Lilas, the driver, is a prostitute, and she discovers that she has a thing or two to teach the kid about femininity and men. Before long, the precocious youth is trying out her newfound powers of seduction on a family friend.
