Synopsis: Scotland Yard detective Lieutenant Holt (Hugh Williams) is charged with investigating the mysterious drowning of five people. Lugosi plays Doctor Orloff who has written the insurance policies on all of the victims. Holt's investigation leads him to a home for the blind after he discovers a Braille message in the pocket of the latest murdered body. He enlists the aid of the beautiful daughter (Greta Gynt) of one of the deceased to help investigate the murderous activities at the home. The inspector finds himself racing against the clock to put the pieces of the mysterious puzzle together before another murder takes place and the surprise ending is revealed.
Alternate Title(s): Dead Eyes of London, The Human Monster