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.

A tobacco planter on Réunion island in the Indian Ocean becomes engaged through correspondence to a French woman he does not know. The woman that arrives does not look like the picture he received, but he marries her anyway.

Marseilles, 1919. Georges Sarret is a distinguished and respected lawyer, recently honoured for his services in the First World War. He takes as his lover Philomène Schmidt, a young German woman, who has just lost her job and home. To enable Philomène to remain in France, Georges finds her a husband – who dies conveniently of natural causes a month after the wedding. Georges repeats the trick with Philomène's sister, Catherine – marrying her off to an old man who dies suddenly so that the scheming trio can profit from his life insurance. When an accomplice in the scheme, Marcel Chambon, threatens to blackmail them, Georges and his two lovers have no option but to kill him and his mistress...

Henri Serin (Jean-Pierre Marielle), an umbrella salesman, leads a quiet life between his work, his family and his passion for painting. During his many business trips, Henri indulges in a few amorous escapades, which provide a welcome change from the tiresome daily routine his bigoted wife locks him into. One fine day, Henri decides to drop everything and live on love and fresh water. He ends up in Pont-Aven, where he meets Émile, a local painter imitating Gauguin, with whom he shares his drinking and other feminine attractions.

In the north of France, the life of a nice family of marginalized.

Two young pretty Parisiennes sell their place and leave behind the capital and its pollutions to live a healthy and bucolic life in a small village in the south of France. Their arrival is an event.

Roger Blanchard has a busy life. On the family side, he is married and has two children, aged ten and fifteen. On the work side, he holds an important position at the Ministry of Culture. To bolster his social status, he has a mistress to liven up his Saturdays. But nothing is going right. His wife Marion exasperates him, his children irritate him, his job gives him no real satisfaction, his mistress neglects him and his superior, Monsieur Gambaud, gets on his nerves. But when he meets a beautiful young secretary, his life and habits are turned upside down: Blanchard amuses him and gets his way. In revenge, Gambaud warns Blanchard's wife.

In a small French village, an angel appears disguised as a beautiful young blond.

Young sociologist Stanislas Previne is writing a thesis on criminal women, so he visits Camille Bliss in prison for an interview. Accused of murdering her husband and her lover, Camille recounts her life and love affairs.

Marie is nineteen and bored in her little suburban life with no future. In a café, she meets the charismatic and beautiful Gerard. Blinded by adoration, Mary decides to leave her parents and her clerk job to live with the man she considers as the love of her life. But Gerard is a pimp, who soon forces her into prostitution. From within homes to out on the streets, the young woman gradually discovers a world of decay and violence.