Ellery Queen

This is one of the classic TV whodunits -- with a twist. The show's format was such that the audience would see everything that the show's namesake character would see, including all of the clues, and then, right before the final scene started (you know... the one where all the suspects are brought into the room for the "YOU... killed the victim. And you did it because..." scene, the star (Ellery Queen, of course) would turn to the TV audience and state "Okay, you've got all the clues. Do you know who did it? I think I do. Can you guess?" And the audience had the chance to be part of the show. Quite unique and half the fun.