Not worth your time - Terrible writers! *spoilers*
*spoilers!*
This is a terrible series. Don't waste your time watching it. It seems realistic at first, but then the main character, the DI, makes so many mistakes that it isn't even funny. The acting is fine, but the plot is completely stupid. Full of plot-holes and silly "coincidences".
The DI botched up a previous case, and he moved to a different police station. The fist case he gets, is similar to the previous one!!! What a coincidence! And surprise!... he botches it, too! By allowing a colleague to beat up the main suspect! Such a stupid error... in real life, he would be extra careful because of his past problems. The "funny" thing is that he repeats a few times that he will not mess up this case, and then he goes on to mess it up!
Not only that, but the victim's father had a affair, the first he ever had, ... just 50 yards from the place where he son was killed, and at about the same time when his son was killed!!! So, he doesn't have a alibi! And it just happened that his work-partner didn't have an alibi either. What a coincidence!
I've listed only a few of the stupid coincidences, there are many more! Such silly coincidences do not happen even in movies that target 10-year olds. Such a sloppy writing!...