Upon the death of his brother, Talbot returns from America to his ancestral home in Wales. He visits a gypsy camp with Jenny, a village girl, he is attacked by Bela, a gypsy who has turned into a werewolf. Talbot kills the werewolf but is bitten during the fight. Bela's mother tells him that this will cause him to become a werewolf at each full moon. Talbot confesses his plight to his unbelieving father, Sir John, who then joins the villagers in a hunt for the wolf. Talbot, transformed by the full moon, heads for the forest and a fateful meeting with both Sir John.