Residents of the medieval German town of Kirchrode are shocked by a series of brutal murders of young women. Everyone suspects Freya Zeckler, who is considered a witch and faces death. The alchemist Lapidius, trying to cure Freya from a terrible disease, investigates the murders and comes to the conclusion that they are all the result of the worship of Satan by some unknown criminals. A trail of blood leads Lapidius to the cave of the Sabbat, where he tracks down three werewolves who committed their terrible atrocities...