In London, philanthropist Dr. Orloff (Bela Lugosi) volunteers his services at a home for blind men, which serves as a cover for his notorious exploits. On the side, Orloff runs an insurance company that offers loans to desperate, unattached men, whom he convinces to list him as a beneficiary. With the aid of a blind man from the home, Orloff then coldly murders the men to collect the insurance. Although the police begin an investigation, Orloff brazenly continues the brutal killings.