Jan 2, 2012
Mr. Keen, Tracer of Lost Persons, was the longest-running radio
detective show of all time. In the 18 years it was on the
air, it aired 1,690 episodes.
Mr. Keen began in 1937 as a three-a-week serial, and in December 1943 it became a half-hour stand-alone show.
Mr. Keen was played by Bennett Kilpack, and his dimwitted partner, Jim Clancy, was played by Mike Kelly.
This episode, The Case of the Leaping Dog, first aired on April 13, 1944.