When an elusive killer vanishes after a string of murders, Anna, a mute young woman and the sole survivor, is urgently evacuated to a windswept Atlantic island. There lives Victor Coste, a cop in self-imposed exile on the other side of the world. Cut off from everything, he accepts one last mission: to get Anna to talk in order to identify the killer and prevent him from striking again. But when the densest fog in the world descends, a race against time begins, as the island itself becomes a trap…