A group of nuns become possessed by demons and are then tortured in a dungeon of horrors during the inquisition.

Following the death of her father, a young girl visits her estranged family at their sinister castle in the countryside, and comes to realize her eccentric and morbid relatives are not quite alive.

Luisa visits her dying mother at Karlstein Castle. Before she dies, she tells Luisa that the Karlsteins are a family of vampires and that her ancestor, the original Count Karlstein, lies buried in the crypt.