DON JUAN OR IF DON JUAN WERE A WOMAN

In France, Jeanne arrives at a funeral service to visit her cousin Paul, a priest. As Paul prays, he sees Jeanne. When the funeral is over, the two converse having not seen each other in a year, to which Jeanne confesses she has killed someone. Back at her residence, Jeanne talks with Léporella, her secretary, about inheriting her father's wealth after he died of a heart attack. She believes she is the reincarnation of Don Juan and prides herself in the destruction of men who have fallen for her charms. Shortly after, Léporella leaves and Paul arrives. He questions Jeanne's claim that she had murdered someone, to which she recounts the story.

At an archery competition, Jeanne and Paul watch Pierre Gonzagues, a magistrate, win the championship. Pierre drives Jeanne home where as a married man, he states he has had adulterous affairs. They have an affair, but he leaves while she is bathing. A week later, Jeanne is invited to a dinner by Pierre's wife, along with a playwright and his girlfriend. Three months later, she visits Pierre outside as he leaves his workplace. At Pierre's residence, Jeanne confesses her love towards him, but he declines to continue their affair.

Angered at his rejection, Jeanne schemes to trap Pierre in a scandal, in which she invites him to a secluded mansion on an island near Sweden. The two have a brief contentious argument, but days later, they subsequently party at a university. During an orgy, a brief fight occurs, in which a female blonde student is struck. Pierre is then photographed helping the student, which gets published in the French press. This causes a political scandal, and Pierre's wife divorces him.

Back in France, Pierre is nearly destitute. He enters a bar where he spots Jeanne whom he blames for ruining him. Jeanne then rides with Louis Prévost and his wife Clara. Later that night, Louis hosts a party at his suite. There, Clara discusses her marriage with Jeanne, in which Clara states Louis is a savage. Angered, Louis tosses Clara into an interior pool, upsetting Clara who runs upstairs. Afterwards, Jeanne accepts an invitation to London with Louis and Clara. On the train ride there, Jeanne and Clara form a romantic bond.

In London, Louis finds Jeanne and Clara in bed together, in which he hopes to engage in a ménage à trois. However, the two women dress together for a walk, but Louis orders them to stay. Jeanne spitefully tells Louis she was never interested in him, and instead wanted to possess him through Clara. In anger, Louis repeatedly slaps her. Jeanne briefly pauses on recounting her story, declining to reveal her true crime. Paul decides to leave until he learns Jeanne has locked the door from the inside. She and Paul fight over the house key, and Jeanne continues her story.

Jeanne then reflects on her relationship with the guitarist, whom she had spotted at Louis's party. After the nightclub closes, the guitarist continues to serenade Jeanne. Jeanne asks the guitarist if he will give up everything for her. He agrees, and the two consummate until she leaves. Depressed, the guitarist slits his wrists with broken glass. Jeanne calls the ambulance but the guitarist is dead.

Jeanne confesses her guilt, and she and Paul have sex. Jeanne meets with Léporella where she spots Pierre outside, wherein she arranges to meet with him tomorrow. Before Jeanne arrives, Pierre doses the floor with gasoline, and when she does, he ignites a fire. Pierre escapes, but Jeanne is burnt alive.