Boris Karloff captivates the screen in the gripping tale of betrayal and revenge, the Black Castle. A forbidding castle in the Black Forest holds dangers for Sir Ronald Burton (Richard Greene) when he is invited there for a hunt by the cruel Count von Bruno (Stephen McNally). Burton, searching for evidence that the count murdered his friends, becomes ensnared in a cat-and-mouse game that turns deadly when he falls in love with the counts wife, Elga (Paula Corday). Lovely Elga is being held prisoner by the count with the help of his hulking servant Gargon (Lon Chaney, Jr..). Only the castle physician, Dr. Meissen (Karloff), may have the power to free the lovers, but his method could put them in even greater jeopardy.