Marie returns to live in La Rochelle, the city of her childhood, with her husband Marc, a policeman, and meets Nadia. The two young women scour the city's stores, looking for a red sofa. They soon discover one in the store of Maxime, a second-hand dealer. A few days later, Nadia seems tormented when Marie mentions the sofa. During a visit, Marie discovers Nadia's lifeless body.
