Suspicion was not your regular whodunit radio show. On the air in the mid 1930s, the show featured murder and mayhem like normal but there was no solution at the end. Instead, the listening audience was instructed to listen for a clue because there was always a clue that lead to the solution. Audiences were then encouraged to mail in the solution before the next show.
old time radio picture talk about a captive audience! If listeners wanted to know who committed the crime and if they guessed the correct clue, they had to listen to the next show. If you missed the show, you were out of luck!