A female rock band acquires an infamous composition by Niccolò Paganini that was used in satanic rituals. When the band decides to record the song and film a video in Paganini's old mansion, the spirit of the deceased composer is summoned and the band unlocks a portal to Hell.
Wealthy businessman Giorgio Mainardi has died of a stomach hemorrhage, but his ghost is not so sure that it was a random misfortune and wants to know the truth. Unfortunately, almost everyone around him is happy to see him gone. Everyone, that is, except for his daughter Rosy, who still feels affection for her father even though they have drifted apart. With her medical student boyfriend, Johnathan, Rosy will try to get to the bottom of her father's death.
A group of tenants and visitors are trapped in a 10-story high-rise apartment building infested with demons who proceed to hunt the dwindling humans down.
