Inner Sanctum Mysteries aired from January 7, 1941 to October 5, 1952. Featuring a combo of mystery, terror and suspense, 526 episodes were made. The series was created by Himan Brown, who later created CBS Radio Mystery Theater. An INNER SANCTUM show trademark was the eerie creaking door sound that opened and closed the broadcasts. Oddly enough, the sound was actually made by a rusty desk chair and not a door.