Gervaise Macquart is a beautiful Parisian laundress and mother whose lover, Lantier, walks out on her. She eventually marries Henri Coupeau, a roofer who has an unfortunate accident. As her now crippled husband descends into alcoholism, Gervaise tries to make ends meet on her own. Life becomes even more complicated when Lantier returns and befriends Henri. Meanwhile, the man she really loves is sent to prison.

Dr. Cordelier, living in a suburb of Paris, withdraws from society to pursue research into the functioning of the human brain. His lifelong friend, Maître Joly, becomes concerned when Cordelier draws up a will that bequeaths his entire estate to a stranger, Monsieur Opale; he cannot understand why Cordelier defends him, considering Opale attacks women and children. After a colleague is killed, Joly confronts Cordelier and discovers the truth behind his friend's behavior.

New Europe presidential candidate Etienne Alexis is a scientist promoting artificial insemination for social betterment and therapy to eliminate passion. To celebrate his engagement to a cousin, he hosts an aseptic picnic, where Mother Nature asserts herself. A shepherd's flute conjures a windstorm throwing Alexis together with the luscious Nénette, a farm lass who, although unimpressed with men, wants to have a baby.

In a port area of ​​France, clashes between a gang of young delinquents and a tribe of gypsies.

Meant to be a psychological study of a dysfunctional couple and an equally unbalanced maid, this slow-paced, murky melodrama stars Michele Morgan and Robert Hossein as Thelma and Jess, two Americans who move into a down-at-the-heels Paris neighborhood. The couple is still suffering from the loss of their only son in an automobile accident that happened some time in the distant past. Thelma tends to drown her sorrows in alcohol, while Jess is introspected and morose. After they hire a maid to help out with the housework, she falls for the taciturn Jess. Her interest seems to be only a simple attraction, yet appearances, as it turns out, are deceiving.

In France, during the Second World War, journalist Paul Roy is a member of the Resistance, while his colleague and friend Jacques Médina is a collaborator. But it's thanks to Jacques that Paul is able to remain free, as he shelters him in his home after a roundup. The two friends co-wrote various Nazi propaganda articles, which appeared under Jacques' byline. The situation becomes complicated when Paul becomes the lover of Jacques' wife.

The film is a road movie that follows a middle aged man who gives a young woman a lift. On the car radio, news bulletins warn the population against a recently escaped sadist who is known to prey on young women and children. Lelouch often cuts away from the main story, if only briefly, to parallel events that are not necessarily crucial to the story but illustrate what is suggested by the radio.