Count Dracula's Great Love (1973)

Stranded at the foot of the Carpathians after a bloody accident at the infamous Borgo Pass, a quintet of passengers--four young women and a man--seek shelter in the latest acquisition of eccentric Dr Wendell Marlowe: a cavernous former sanatorium. Now, the guests have no other option but to spend the night in the cold, rumour-ridden castle; however, it is not before long that, one after another, they fall under the spell of their courteous, cryptic host. But, if the hair-raising legend of vampires is true, what will it take to rid the land of Count Dracula's unholy stigma?