The Floating Dutchman

The Floating Dutchman is a 1952 British crime film directed by Vernon Sewell and starring Dermot Walsh, Sydney Tafler and Mary Germaine. It was known as Clue for a Corpse on U.S. TV. The film was an early product of Merton Park Studios, a British company best known for its Edgar Wallace Mysteries of the 1960s. Its plot involves Dermot Walsh as a Scotland Yard detective who goes undercover amongst jewel thieves after a dead Dutchman is found floating in the river. It is based on a novel by Nicholas Bentley.

Source: Wikipedia