In keeping with my accidental ESG theme, here are three episodes of Christopher London, another radio series created by Gardner, or -- at least -- based on a character created by Gardner. This is, I have no knowledge of this character from the Gardner stories; so he is either based one a character in a one-shot story or was created for the show. London is a private eye who will do anything or go anywhere if the money is right. So let's go back to Sunday evenings in 1950 when the entire family was huddled by the radio.
By the way, if the voice of the title character seems familiar, you are right. Glenn Ford played Christopher London.