L'île aux femmes.

Marie Hersant, a police captain, arrives on Ouessant, the island where she grew up, to investigate the disturbing disappearance of her childhood friend Sandrine. This is an opportunity for Marie, who is five months pregnant, to reconnect with her mother, Gaëlle. But soon Sandrine's body is washed up by the sea as a storm breaks out, cutting off all connection with the mainland...