Carpathia, High Werewolfsville: On their rehabilitation trip, celebrated opera singer Count Felix Teleke of Tölöke and his faithful servant Ignác come across half-dead gamekeeper Vilja who has been trying to reveal the secret of the mysterious Devil's Castle which is rumored to be haunted. The Count discovers that the crumbling castle is the seat of Baron Gorc who uses fantastic inventions of mad scientist Orfanik to carry out his devilish plans. Count Teleke suspects that Baron Gorc has imprisoned Teleke's fiancée, famous opera diva Salsa Verde, in the ruins of his castle...