The Cornish village of Porthcorran is stricken with fear when brilliant young biochemist Dr Peter Blood (Kieron Moore) returns to join his father after a prolonged research course in Vienna.
The senior Dr Blood (Ian Hunter) is horrified to discover that his son is poisoning the locals one by one, to perform experiments in an abandoned mine, taking the hearts out of living men to transplant into a corpse.
His father’s nurse, Linda Parker (Hazel Court), discovers the monstrous plan and alerts villagers just as Peter goes a bit too far in his experiments – and there’s a gory ending as anyone might predict.
Dr Peter Blood
Nurse Linda Parker
Dr Robert Blood
Kenneth J. Warren
Mr G F Morton
Sidney J. Furie