With angry villagers driving them away from their castle in Transylvania, Count Dracula (Christopher Lee) and his son Ferdinand (Bernard Ménez) head abroad. The Prince of Darkness ends up in London, England where he becomes a horror movie star exploiting his vampire status. His son, meanwhile, is ashamed of his roots and ends up a night watchman in Paris, France where he falls for a girl. Naturally, tensions arise when father and son are reunited and both take a liking to the same girl.