Man investigates the disappearance of two of his friends who were the guests of a sinister Austrian count.

The British noble Sir Ronald Burton decides to search his two best friends that have disappeared after visiting Count Karl von Bruno, an evil and powerful man who lives in the Black Castle. Sir Burton travels undercover with another identity, since he fought against Count von Bruno in Afrika with his two missing friends and the count lost one eye in the battle. When he arrives in the castle, he is invited to hunt in the Black Forest around the castle with the count,.while he looks for evidences that the count has killed his friends. Later, he and the count's wife, Countess Elga von Bruno, fall in love for each other and with the support of Dr. Meissen, Sir Burton and the countess try to escape from the claws of Count von Bruno.—Claudio Carvalho, Rio de Janeiro, Brazil