Insanity! Grave robbers! Creepy crypts! Naughty maids! Gothic castle! What more could we ask for? Dr. Garondet is summoned to Orloff's castle. No one in town will bring him, as everyone fears Orloff (Howard Vernon). When he arrives he finds two servants, and realizes that the maid (Evane Hanska) sent for him, but she is too scared to tell him why. Then he meets, Cecile (Brigitte Carva), Orloff's daughter. She tells the doctor of an unbelievable tale. Cecile believes she is being stalked by an invisible fiend. The doctor then barges into Orloff's lab and meets the mad scientist and the invisible creation. The two doctors square off and Orloff tells Garondet about his creation. As he explains his experiments to Garondet, it is apparent that Orloff demands loyalty. When he finds out that his maid summoned Garondet, he gives the maid to his creation. Unfortunately for the maid, the creation rips her clothes off and subjects her to a fate worse than Rhona Mitra's. Unlike "Hollow Man," this scene is not cut.
Orloff isn't entirely magnanimous. He needs human blood to continue his experiments which will someday yield a master race which can rule the world. Now Garondet is a prisoner and apparently out of luck. Oh yes..his only hope....Cecile? Well apparently she died six years ago and lost all her sanity when she woke up in her crypt as grave robbers were pulling off her jewelry. Cecile's story is a gruesome one which contains lots of nudity, blood, and revenge. As the film vaults to it's wild conclusion, the exact nature of the invisible man is shown. However brutal the rape scene appeared, when we find out the true identity of the invisible nymphomaniac, the scene becomes horrific.