Agatha Christie’s Poirot is a series of radio stories created by the Mutual Broadcasting Network (MBS) and broadcast in the U.S. between 1945 and 1946. The series comprised some 51 half-hour episodes broadcast weekly and featuring Harold Huber as Hercule Poirot.
https://agathachristie.fandom.com/wiki/Agatha_Christie%27s_Poirot_(radio_series)