The program aired Sunday afternoons at 2:45pm on the Mutual Broadcasting System from October 3, 1948, until March 26, 1950.
[3] The show usually opened with Blackstone (Ed Jerome) and his assistant Rhoda Brent (Fran Carlon) talking with a friend of theirs, either Don Hancock or Alan Kent (played by the episodes' announcers in-character as themselves) or John (Ted Osborne).
A past adventure of Blackstone's would come up in conversation, and that mystery story was then dramatized as a flashback.
After the mystery's climax, the narrative returned to the three main characters as Blackstone performed a magic trick.
After a commercial break handled by the announcer, Blackstone returned to demonstrate and explain the trick so that listeners could perform it for the amusement of their friends.