Count Dracula (Alexander D’Arcy) and his vampire wife (Paula Raymond) are occupying Falcon Rock Castle in modern-day Arizona, hiding behind the identities of Count and Countess Townsend. When the castle’s owner dies, the property passes on to a photographer named Glen Cannon, and Glen has decided to live there himself with his fiancée Liz. He drives out to the castle to inform the Townsends that they will have to move out. But his car breaks down when he gets there, and he and Liz are forced to spend the night with the Townsends.
The Townsends are actually vampires who sleep in coffins and lure pretty young girls to the castle to be drained of blood by their butler George (John Carradine), who then mixes real Bloody Marys for the couple, which they drink from martini glasses. George and Mango the hunchback keep mini-skirted women chained up in the basement, occasionally sacrificing one of them to “the Great God Luna” by burning them at the stake. Then there is a guy named Johnny, who becomes a serial killer when the moonlight strikes him (or a werewolf, depending on whether you watch the theatrical version or the late-night-TV version, the latter of which added a few quick and cheesy werewolf scenes).
Glen and Liz accidentally witness one of the women being sacrificed in the cellar. Dracula and the Countess try to force Glen to sell the castle to them. In the final confrontation, George the butler is killed, the remaining women prisoners are freed, Mango the hunchback gets shot, hit with an ax and set afire before dying, and the vampires wind up exposed to sunlight and dissolve away into dust. Glen and Liz decide not to live in the castle after all, and drive off together. However, two bats emerge unseen from the ashes and fly away. The End?