In the 17th century, an order of monks in Italy capture and entomb a demon that has possessed a member of their group. 400 years later, school teacher Elizabeth Magrino visits the monastery in order to do some research. What she and the current monks do not realize is that the evil hiding within the catacombs has unwittingly been released.

Police Comissioner Datti is investigating the murder of a female doctor whose murderer seems to be a thirty-fivish year old man. Soon another murder follows: Pianist Robert Dominici's girlfriend is found killed. The killer also challenges Datti on the phone and says he can't be caught since he has a secret which makes him invulnerable. In the meantime the clues seems to point in strange directions...

1987 film by Claudio Fragasso, Bruno Mattei