After being thrown out of medical school for ethical violations, Dr. Peter Blood (Kieron Moore) returns home to a small Cornish village, where he sets up a research laboratory in a secluded cave. There, he attempts to revive the dead, using kidnapped humans -- who he views as unworthy of life -- for their body parts. Specifically, their hearts. Dr. Blood eventually succeeds, but his progress is threatened when Linda Parker (Hazel Court), his ill father's nurse, discovers his ghastly crimes.