The third in a series of films featuring François Truffaut's alter-ego, Antoine Doinel, the story resumes with Antoine being discharged from military service. His sweetheart Christine's father lands Antoine a job as a security guard, which he promptly loses. Stumbling into a position assisting a private detective, Antoine falls for his employers' seductive wife, Fabienne, and finds that he must choose between the older woman and Christine.

In a small town in post-WWII France, 16-year-old Janine tries to improve her conditions by any means necessary. Three people—Michel, a married lover; Raoul, a fellow thief; Mauricette, a photographer she meets in prison—will help her learn from her mistakes.

Babou seems to be able to shrug off anything. Real jobs, husbands, responsibilities, who needs them? But when she finds out that her own daughter is too ashamed of her to invite her to her wedding, she decides to make some changes.

An old psychiatrist finds out that he is likely to suffer a second and probably fatal heart attack in the near future. As a consequence he becomes determined to seduce Odile, a young woman he first encounters in a railway compartment.

A schoolboy Nicholas always worries about something. When he goes on a school skiing trip, all his visions and nightmares take him over.

A hard-working young man meets and falls in love with his sister's bridesmaid. He soon finds out how disturbed she really is.

Justine and Richard's 15-year relationship ends in separation due to irreconcilable differences with Justine maintaining custody of their three boys. Her new life means having to deal with being a single parent but at the same time, she comes to terms with her own parents' divorce and finds a common bond with her long-suffering mother. Richard, a renowned author, deals with the situation by devoting all his attention to his writing. Both are forced to confront their uncertain futures, while examining what led to the breakdown of their marriage.

Laurent's fate is to be a soccer superstar. But he happens to fall in love with a Fabienne, 40. He is only 18, and his career is about to fall apart...

30 ans, l'âge des responsabilités... Martin s'apprête à partir en vacances avec sa femme Ariane et sa fille Cerise, 4 mois... C'est alors qu'il croise Constance, son ex, son amour de jeunesse, elle-même flanquée de deux marmots. C'est décidé : on passera quelques jours ensemble, au soleil, dans la maison familiale. Comme au bon vieux temps.

Mélanie, in her thirties, trains future confectionery sales representatives. Among them is Annick, in her fifties, who makes no secret of her contempt for her sales techniques.