This quaint horror anthology is loosely based on the works of horror novelist R. Chetwynd-Hayes -- who is portrayed by John Carradine as an active participant in his own tales. The author is invited by a suave vampire (Vincent Price) to accompany him to the title establishment, where he observes the secret social customs of various species of monsters -- which apparently include drinking, dancing, and watching undead strippers remove more than just their clothing. He is also made privy to the mating patterns of these creatures, whose tendency to inter-breed creates such new strains of monsters as the "shadmock" (a vampire-like entity with a deadly high-pitched whistle) and the "humgoo" (the sullen offspring of a human and a flesh-eating ghoul). Price's descriptions of these new beasties trigger accompanying vignettes far less entertaining than the framing story, which is rife with horror movie in-jokes, cheesy rubber monster masks, and music by pop-reggae band UB40(!). Accomplished horror-omnibus director Roy Ward Baker seems to delight in the opportunity for pure camp, although the overall silliness of the proceedings has put off more than a few horror buffs.
by Cavett Binion synopsis