The shadow of Mont st Michel

After the death of his mother Elisa Claire Borotra is responsible for custody of her sister Audrey Penelope Leveque a troubled teen and something he hardly knows Following the last will of her mother both go to Mont Saint Michel where the two grew up to spread his ashes The second night of stay and after a flood Audrey disappears while the mayors daughter which suggests a voluntary escape but Elisa does not think so so it will not stop until its trace sister