I'm not always a fan of period pieces, but Copper is amazing. If Deadwood, Hell on Wheels, and CSI somehow had a classy Bostonian baby, you would get Copper. The writing and the acting is superb. The character of Annie, a little girl prostitute rescued by Kevin, is especially interesting. This show is packed with good action, tense moments, tender gestures, and a whole lot of racial tension.
My one quibble is the amount of CSI work done by Kevin through his doctor friend. He's a practicing doctor, a surgeon, a coroner, and apparently an expert in whatever area of science is necessary to uncover a clue. It's a bit of a stretch.
Despite this, the overarching mystery of the show is interesting rather than cumbersome as some mystery plot lines can become. Also, the lack of a case of the week format and the fact that the stuff Kevin looks into is interesting offset the forensics - especially since by and large no one except Kevin cares about the forensics or even who the culprit actually is, so it ultimately plays little role in the episodes.