Ellery Queen addressed the audience directly towards the end of each episode to ask if they had deciphered the mystery.
The final DuMont broadcast was on 6 December 1951, and the series then moved to ABC.
Lee Bowman was called in to play Ellery Queen after Richard Hart suffered a heart attack and died before he could complete the season.
Most of the DuMont Network-era episodes no longer exist in any format.
Surviving recordings of this series are highly prized by DuMont Television Network fans.