Henry Cass’s Blood of the Vampire (scripted by Jimmy Sangster) blends gothic atmosphere with mad-science horror. Set in a 19th-century Transylvanian prison, a sadistic doctor conducts forbidden experiments that blur the line between life and death. Though not a Hammer production, it channels the same era’s lurid color style and Victorian chills.

Från IMDB:
In 1870s Transylvania, scientist Dr. Callistratus is put to death by villagers who wrongly believe he's a vampire. However, his horribly disfigured henchman, Carl is on hand to orchestrate a life-saving heart transplant.