Today's Mystery: A sixteen-year-old girl hires Spade to find her brother, a notorious criminal. Original Radio Broadcast Date: April 6, 1951 Originated from Hollywood Starred Steven Dunne as Sam Spade, Lurene Tuttle as Effie, Cathy Lewis, Lou Merrill, William Conrad, Paul Frees, Jerry Hausner,Kathleen Freeman, William Tracy Support the show…