Baron Wolf von Frankenstein (Basil Rathbone), son of Victor Frankenstein, relocates his wife Elsa (Josephine Hutchinson) and their young son Peter (Donnie Dunagan) to the family castle. Wolf wants to redeem his father's reputation, but finds that such a feat will be harder than he thought after he encounters hostility from the villagers, who resent him for the destruction his father's Frankenstein's Monster wreaked years before. Aside from his family, Wolf's only friend is the local policeman Inspector Krogh (Lionel Atwill) who bears an artificial arm, his real arm having been "ripped out by the roots" in an encounter with the Monster as a child.