After a nice sailing cruise, Bill, Joe, Fred, and Jane's dune buggy runs out of petrol. Bill gave Jane a paranormal pearl necklace earlier in the day, which opens a can of worms. Lord and Lady Alexander, who own the mansion, are hosting a weird ceremony that night attended by eccentrics in black robes. Jane exits her sleep chamber in a daze and is led to a sacrifice alter by the robed houseguests. As a knife is about to be plunged into a young woman, her three companions come to her rescue, but they also witness a chaotic mass murder catastrophe.