Pierre lives with his mother in their château in Normandy, near the banks of the Seine. They are beautiful, rich and carefree. They love each other. Every morning, Pierre rides the motorbike that his father left him to the home of his fiancée, the blond and poignant Lucie. They love each other. One night, Marie tells Pierre that she has set the date for his wedding to Lucie. Pierre immediately sets off to tell her the news. But, on the way, at the edge of a dark forest, a mournfully beautiful woman appears in his headlight’s beam. She speask with a strong Eastern European accent. "Pierre… you are not the only child… I’m your sister, Isabelle." Pierre can’t believe her.