Navigating the treacherous social tides of high school, Marine is cut adrift by Océane, her older sister who’s caught in the thrall of an older man. Meanwhile, their mother struggles to keep her head above water.

Simon has to leave the island on which he lives to go to boarding school. One day he plays with his sister and finds a beached little wooden boat. Through his attempts to repair it he will accept, or not, to cast off.

A clever boy designs a creative ploy to protect his little sister from repeated monster attacks.