A serial killer, who drains his victims for blood is on the loose in London, the Police follow him to a house owned by an eccentric scientist.

After their parents divorce, one daughter lives with her mother in England while the other lives with her father in Portugal. After the untimely death of her mother, the one daughter stands to inherit a large sum of money and also a number of documents containing information that will incriminate her father, who was a crooked judge. While her father wants the documents, her sister wants the money and they will each stop at nothing, even murder, to get what they want.

Inspector Holloway is investigating a series of brutal murders in which a doll of each victim is found at the scene. The dolls, as it turns out,were purchased by the crippled Mrs. Von Sturm, whose home is overcrowded with a doll collection. Her pale, wide-eyed, neurotic son is the prime suspect and the daughter of one of the victims discovers the shocking truth.