I grew up listening to radio. We didn't have a television until I was in high school.
If you had the experience I think you'll agree, radio gave us something the TV generation missed out on. Listening to radio inspired more use of imagination than that required by the visual media. I'm not saying television viewers lack imagination.
The point is radio, as in reading, requires the listener to imagine the scene, create the speaker in his mind--'pictures' and sound that are more personal than those projected visually. Who can forget that squeaking door and the eerie organ music of 'Inner Sanctum'? Or the sonorous voice of 'The Shadow'? Do you see The Whistler?
I believe listening to those old time radio shows was as much an incentive as my youthful reading in inspiring me to want to write my own stories. Willa Cather said much of the material a writer uses is acquired before the age of fifteen.
I spent a lot of time listening to those old radio shows in those teen and earlier years. These included Inner Sanctum, The Whistler (noted for its unexpected twists at the end), Mr. and Mrs. North, Boston Blackie and many others. One of my favorites was 'I Love a Mystery,' about three friends who ran a detective agency and traveled the world in search of adventure. It originally aired from 1939 to 1944 and then was revived and ran from 1948 to 1952. I was too young for those earlier episodes, but many are still available online.
The Shadow, one of the most popular of radio shows, ran from 1930-1954, prompted a magazine and a series of novels. The opening line is haunting, "Who knows what evil lurks in the hearts of men? The Shadow knows."
Mr. Keen, Tracer of Lost Persons, was another popular show and one of the longest running, 1937-1955.
The radio version of The Thin Man, based on Dashiell Hammett's novel, ran in 1936, before I was born, but I've seen the film and the TV adaptation. William Powell and Myrna Loy reprised their film roles in the radio show but were replaced by Peter Lawford and Phyllis Kirk on TV.
Of course mysteries weren't the only shows I listened to. There were also many good Westerns, comedies and drama. Still, mysteries remain my favorite.