The mind of Pierre Bérard, a successful middle-aged architect, is torn between his unstable present with Hélène, his younger lover, and his happy memories of the past with Catherine, his ex-wife; but his true destiny awaits him at a crossroads on his way to Rennes…

Four young people, tired of working life, decide that they can earn money from crime than they can from work. The film follows their training at the first "crime school", as well as their work.

A femme fatale falls in love with a Venetian count, implacable enemy of Selim, who pursues his sister with his diligence. This one makes stop and condemn to death the count who made an attempt on his life. Then he offers the woman her father's salvation in exchange for her favors. A snake kills him, the count is shot and the woman finally takes the veil.

After several inhabitants of a new city were bitten by dogs, a young doctor tries to put a stop to the climb of violence.

Boulevard focuses on Georges 'Jojo' Castagnier, an adolescent who lives in a poor room under the roof of a block of apartments in the Pigalle section of Paris. He ran away from home when he realized that his step-mother hated him from day-one. Among Jojo's many neighbors is the gorgeous Jenny Dorr , a nightclub dancer, whose lover he dreams of being. But, to Jojo's disappointment, Jenny becomes the lover of Dicky, a former boxer, who spends his time loafing about the Pigalle cafés. Jojo lacks for steady work, but manages to meet his financial obligations with a series of odd jobs. He tries selling magazines, which is a success for a while, though posing as Narcissus for two gay artists proves to be something of a disaster. Eventually, he woos Marietta, one of his other neighbors and a girl more suited to his age. But when things go really awry, Jojo becomes desperate and tries to commit suicide by jumping off the roof of his building

In the heart of Paris, a restaurateur's mundane life is disrupted by the arrival of his ex-wife's daughter, who claims to be in need after her mother's death. After marrying her, tensions rise when she becomes involved with a young student, leading to betrayal and murder. As secrets unfold, he uncovers the truth about her past and her manipulative nature.

The film consists of seven roughly 15 minute episodes, each showing what will happen if one or more of the Ten Commandments will be broken: Jérome Chambard is warned that he will lose his job if he continues to swear; Françoise Beaufort enamored of a stripper calls on her only to find her married to a janitor who doesn't know what kind of dancing his wife performs; Denis, a Jesuit novice, leaves the order to avenge his sister's suicide, which was provoked by Garigny, who seduced her into prostitution and drug addiction; Philip buys a necklace for Micheline though he is bored with her; a young man find out that his real mother is not Madeleine, but actress Clarisse Ardant; Didier Marin, cashier of a bank, was fired by his boss; the Devil appears as a serpent for Jérome Chambard and the bishop are eating.

Two scriptwriters argue about the fate of Henrietta, a charming and gamine shopgirl. One favors a comical path for their heroine, who is overcome with sentimental love for a young photographer on Bastille Day. The other has a more thrilling and dastardly fate in mind for her. Among the film's irresistible conceits is Hildegarde Neff as an oversexed circus bareback rider.

Tongues start to wag after a famous Parisian music hall dancer is rushed to hospital after being found poisoned by arsenic at the Concert Mayol.

A veteran paratrooper murders his Vietnamese wife when he finds her in the arms of a younger man. Garal (Maurice Ronet) makes it back to the army base where his drunken roommate provides him with an iron clad alibi. Jauran (Michel Bouquet) is the local police inspector who befriends the Garal, unaware he is the killer. The younger man is accused of the woman's murder, but the paratrooper begins to feel overwhelmed with guilt. The longer he remains silent about the crime, the more psychological torture he must endure.