 The title "House of..." refers to the ruins/house owned by Ludwig  Frankenstein, the 2nd son of Henry Frankenstein (portrayed by Cedric  Hardwicke) in "The Ghost of Frankenstein". Its also the same  house where Lawrence Talbot discovers the Monster in ice in  "Frankenstein Meets the Wolfman"; and, of course, where Neiman  discovers the Wolfman and the Monster in this film.