We're putting our little grey cells to work as Hercule Poirot solves two old time radio mysteries. Agatha Christie's brilliant Belgian detective is back on the big screen, and we'll hear two of his adventures from the airwaves. First, Maurice Tarplin is Poirot in an adaptation of Christie's "The Tragedy at Marsdon Manor," originally aired on Murder Clinic on October 6, 1942. Then, Harold Huber steps in for "Murder is a Private Affair," an episode of Hercule Poirot (originally aired on Mutual on November 23, 1945).