Doctor Morelle

Doctor Morelle is a 1949 British mystery film directed by Godfrey Grayson and starring Valentine Dyall, Peter Drury and Hugh Griffith. It was made by Hammer Films and based on a play by Wilfred Burr. It is also known by the alternative title Dr. Morelle The Case of the Missing Heiress. The character also appeared in a long running BBC radio series written by Ernest Dudley. Dudley also wrote many novels and short stories featuring the character.

Source: Wikipedia