The Dark Eyes Of London (aka The Human Monster) (1939)

A doctor (Bela Lugosi) runs a life insurance agency where he loans money on his customer's policies. But an inordinate amount of his customers are found drowned in the Thames river. A Scotland Yard detective (Hugh Williams) attempts to solve the killings and tie them in with the doctor's insurance company. Based on the novel by Edgar Wallace and directed by Walter Summers (AT THE VILLA ROSE). A British horror movie with two Hollywood actors imported for the film. In addition to Lugosi, Edmon Ryan appears as a Chicago police detective sent to London to deliver an extradited prisoner. Retitled THE HUMAN MONSTER in the U.S., the British Board Of Film Censors gave it an H rating, H meaning horrific and thereby no one under 16 was allowed to see it. As cinema, it's an enjoyable piece of B horror pulp although its "twist" is quite obvious despite the dubbing of one of the actors' voice to trick us. With Greta Gynt, Wilfred Walter and May Hallatt.