While on a summer holiday with her family in the south of France, 17-year-old Isabelle decides to lose her virginity to a cute German boy named Felix. The experience leaves her unsatisfied. By autumn she is working as a prostitute at high-class hotels under the name Lea. Among Isabelle's clients is a 63-year-old man named Georges (Johan Leysen), whom she likes. He dies of a heart attack while they are having sex with Isabelle on top. Isabelle tries to resuscitate him, then leaves. In winter the police turn up and inform her mother, Sylvie, about Isabelle being a prostitute and Georges's death. Sylvie flies into a rage and repeatedly slaps Isabelle before apologising and grounding her. Isabelle is forced to give a statement to the police. She says she was first approached by a man on the street to have sex for money, but found it disgusting. After seeing a report about students making money as prostitutes she set up a website, bought a second phone and went into business. As a minor she is the victim and will not be charged, but her mother will keep the money. Sylvia takes Isabelle to see a therapist (Serge Hefez) to help her deal with what happened, including her guilt because she thinks she killed Georges.