After participating in a séance, young Laura begins to behave strangely. Alarmed, her parents ask Father Olmedo, one of the few exorcists authorized by the Vatican to intervene in cases of demonic possession, for help.
A group of friends discover an ancient book, the Necronomicon, the Book of the Deads. They discover that the book is a link between our world and the world of ancients creatures, older than our civilizations.
Cubelles, Tarragona, Spain, Christmas 1985. Five friends make an unexpected discovery in the forest: a woman disguised as Santa Claus trapped in a deep hole dug in the middle of nowhere.