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.
When a horror film based on the same source material as Suspiria and Inferno goes into production, the evil witch the story is based upon manifests herself and not only begins to terrorise the actress set to portray her on screen, but reveals plans to wreck havoc and bloodshed throughout the world.