I remember watching all 8 episodes of this brilliant show. David Soul did a stellar job not only heading up the cast, but his portrayal of John Grayson was a terrific follow up to Starsky and Hutch. As the other reviewers have noted, this show predates all the great crime TV shows: CSI, Criminal Minds, L&O, etc., and that was also the reason for its downfall.
During the Reagan-Bush era, the late 1980s when the show was on, Bible- thumping groups of Americans felt it was their God given right to ruin the fun for everyone else. They launched a campaign against Unsub and subsequently the sponsors pulled out. Thank Dog they didn't succeed with their narrow-minded attempt to also remove the Simpsons, unfortunately, Unsub could not sustain their wrath. My hope is that the shows are re-released on DVD.