The Sadistic Baron Von Klaus

In the village of Holfen, a number of young women are found stabbed to death by what is determined to be an ancient dagger with a curved and rusty blade. The superstitious locals believe the murders to be the fulfillment of a curse placed on them in the 17th century by Baron Von Klaus, a sadistic libertine who killed many women before dying in the swamps surrounding his castle. The Baron's spirit is said to live on in his male descendants, but the reigning Baron, Max (Howard Vernon), has an alibi, and his nephew Ludwig (Hugo Blanco) doesn't arrive in town until the day after the latest murder, accompanied by his fiancée. Arriving in time to speak with his ailing mother before her death, Ludwig is entrusted with a key to his ancestor's torture dungeon and begged to bring an end to the family curse by visiting it, destroying it, and leaving the castle, never to return again. He agrees, but will he have the willpower to resist the lure of his horrific heritage? (official distributor synopsis)