Thorgal has finally returned to his family, but before he can live in peace with them, he still has to bury a ghost of the past: the one of Shaigan, the fearsome pirate he became during his amnesia. In memory of a young girl who was his victim, Thorgal goes towards the Island of Skellingar. In this desolate and hostile place, he will have to face a strange cult that pushes his followers to suicide.