A few weeks before his wedding, Jérôme spends his vacation beside Annecy Lake where he must organise the sale of a family villa. By chance, he runs into Aurora, an old friend from Rumania, who is staying at the house of a mutual acquaintance. Jérôme pays her a visit. Laura, the acquaintance’s strong-minded daughter, is rather attracted to the newcomer. This budding romance provides Aurora, who is a writer, with the subject of her next novel. Jérôme gets caught up in the game and starts seeing Laura regularly. Then Claire, Laura's elder half sister, arrives on the scene and shakes him up in yet another way. Laura subsequently abandons him for a younger man, and Jérôme’s attraction to Claire becomes an obsession.