A decapitated head arrives at the sanitarium of Dr. Con Ee and his daughter-in-law collapses in a spasm of terror. The woman is driven insane with fear by haunting memories and villainous strangers. A ghastly green mask materializes in the windows of the manor and a hypnotist (Bela Lugosi) arrives with his sadistic henchman, a mute dwarf. The doctor and his family fall victim to violent attacks and the household is rocked by a shocking and bizarre revelation that is both surreal and treacherous.
