The film is presented in the form of a diary. Michel, a young man with nothing to do, witnesses the entire process of a thief stealing at the racetrack. He is attracted by the thief's confident and elegant technique and subsequently joins the theft. Michel, who loves reading and adheres to nihilistic philosophy, firmly believes that theft is a ballet of fingers, and a perfect theft is like a brilliant performance art. Michel has a long-absent, seriously ill mother. While visiting her, he meets Jeanne, the neighbor who has been taking care of his mother. The beautiful Jeanne awakens long-dormant feelings in Michel's heart. Michel is targeted by the police. Although the inspector repeatedly gives him chances to reform, Michel remains addicted to his 'art' and cannot extricate himself. Soon, Michel is arrested.
