Touching Evil US is pretty good, but ....
... the UK version is even better.
I didn't know about the original until after watching the US series, which I actually liked a lot.
The US version is a bit more slicked up; the lead is a flamboyant character with a lot of heart, the music is a lot like Tangerine Dream or Miami Vice, and the mood is like an 80s Michael Mann flick. Very good.
The UK version is grittier, less bells and whistles, but just really good storytelling and excellent acting. Robson Green is effortlessly, confidently excellent.
Although the UK version is practically a twin of a later series of Green, Wire in the Blood, another good one.
jmo, to those who liked this one, try the UK version too, and if you liked that, try Wire in the Blood too.