Sabine, a 30-year-old woman, has recently moved to an isolated house near to a river with a dam. She is accompanied by her son Thomas, aged 15. As she tries to settle into her new home, Sabine experiences a series of strange phenomena. She cannot bear to see her son grow up and leave her, and she will do anything to keep him with her...

François and Noémie run a sawmill in the mountains not far from the Swiss border. François has taken over his family's business, making him the fourth generation. He dreams of having a child. After years of failed fertility assistance, they give up on having a baby of their own and turn to adoption. But then François meets Patricia, new to the neighborhood. They begin a passionate affair. Soon after, Patricia gets pregnant.