Frank Marvin Readick Jr. (November 6, 1896 — December 27, 1965) was an American radio and film actor. Born in Seattle, Washington, Readick was well known for his evil laughter that followed the introduction from The Shadow radio drama: "Who knows what evil lurks in the hearts of men? The Shadow knows!". Readick replaced James La Curto to be the narrator in the Detective Story Hour (the precursor of The Shadow) in 1930, four months after the launch of the series when La Curto went for a Broadway role. Readick continued to portray the Shadow on The Blue Coal Radio Revue (1931-1932) and The Love Story Hour (1931-1932) before The Shadow was used as the title of a series. This signature line remained intact in The Shadow even after Orson Welles succeeded Readick.