Ellery Queen

This 1975 show ran only one season (22 episodes plus the pilot), but it was way ahead of its time. Set in the 1940's, mystery  writer Ellery Queen would help his dad solve baffling murder cases. Jim played Ellery as a deep-thinking, thoughtful, respectful young man (even though he was 40 when the show started.) David Wayne played Richard Queen, Ellery's crusty police inspector dad. John Hillerman played Simon Brimmer, Ellery's competition. Simon was a radio show detective who would always attempt to solve the same case Ellery was working on.(Supporting cast members John Hillerman and Ken Swofford would later work on the detective show Magnum P.I.)