Pierre (Guillaume Depardieu) lives with his mother Marie (Catherine Deneuve) in a castle in Normandy by the riverside of the Seine. They are very beautiful, rich, carefree and they like themselves. Every morning, Pierre leaves on the inherited bike of his father to visit Lucie (Delphine Chuillot), his fiance. One night, Marie announces to Pierre that she arranged the date for his marriage to Lucie. Pierre leaves to announce the good news to his fiance. On the way, in the forrest, a funereal beauty appears (Yekaterina Golubeva). She speaks with a strong accent from the countries of the East: "Pierre... you are not the only child, I am your sister, Isabelle.