An architect and his wife are staying in an empty castle in California. They are joined by an unhappily married lawyer and his wife. Things start getting strange when they spot a half man/half beast prowling around the house and keep seeing a headless woman wandering the grounds.

A professor stays in a mysterious castle where all kinds of strange beings live, such as the Wolf Man, the Rubber Boy, the Legless Man, the Living Torso, among others.