SECRET AGENT X-9 on BBC Radio: Episode 3 "The Powers That Be" (1994)

Here's Part 3 of 4. Diane Johnson's book Dashiell Hammett: A Life has some interesting letters between agents of the Division of Investigation (the pre-1935 name for the FBI) asking who the heck was this guy writing the Secret Agent X-9 comic strip. Apparently they were trying to figure out if he was a former agent who might give away their secrets of spycraft. 

Tomorrow: Episode 4 "You're the Top." THE END