The Secrets of Scotland Yard is hosted by Clive Brook, narrator of LM Radio. Brook was a successful director writer, and actor in many films, including âDressed to Thrillâ in 1935, âThe Flemish Farmâ in 1943 and âOn Approvalâ in 1944. He was probably best remembered for playing opposite Marlene Dietrich in the 1932 movie, âShanghai Express.â He also played Sherlock Holmes in the 1932 movie of the same name.