English crime dramas on the BBC tend to be good, so when I spotted the first episode on iPlayer I decided that I'd watch the first episode and take it from there.
I think I was hooked within 15 minutes, the pace was just right, rapid in places agonizing (in a good way...) in others. The way the story unfolds is especially attractive in that almost until the final scene you aren't quite sure of what will happen, even though it might have felt that after the first episode you already knew the entire plot.
The actors involved all gave first rate performances, all of them were believable and possibly more importantly, very familiar, at least on the surface. The way personalities change as the plot progresses (if not in episode order..) is very well done.
Lastly, the whole thing was utterly believable, everything from the methodologies and insecurities portrayed through to the social situations and environment were spot on.
I would recommend it to anyone who is into the genre and probably anyone who has the time to sit down and watch the whole lot. In fact the worst part of watching the four episodes that make up the whole was waiting for the next one to be aired.