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.

As in a Hollywood western, rice growers and bull cultivators come into conflict in the Camargue.

A group of travelers, including a monk, stay in a lonely inn in the mountains. The host confesses the monk his habit of serving poisoned soup to the guests, to rob their possessions and to bury them in the backyard.

During Christmas night, two police officers make their nocturnal rounds, in their round they meet tramps, brawlers in a café, a naked man, a concierge, a sexton, revelers in a nightclub, and end by signing in their report to the police station.

A schoolboy remembers his last holiday in the big house of his family in the country, before it was sold.