Riccardo, belonging to an upper-middle class family from Puglia, studies religion in a Swiss boarding school. He has an incomplete relationship with his half-sister Stefania, who one day announces his engagement and the next marriage. Riccardo, wearing his cassock below, desperately tries to conquer the now reluctant half-sister.

Tourists take a boat to a remote island, where they find that most of the people have disappeared, and something is stalking them. They find a hidden room in the big mansion on a hill, and an ancient diary, which gives them clues to the source of the terror.