I love British cop series. This is not one of the best I have seen, although it certainly maintains the tension until the end. The majority of the series is filmed in Scotland. The photography and landscapes are wonderful!
This one is about cold cases, dealing with a case for a missing girl called Julie Mackie, from 16 years ago. I would have used Scottish folk music, the soundtrack is a bit strange and sometimes doesn't fit with the scenes. Although I noticed it, it didn't bother me too much.
The story is exciting from the beginning, although as it progresses it becomes predictable, with several unexpected surprises as well. Well, I have mixed feelings about this series, since it could have been better by changing two important things, more passion in the actors and a story with more strength, I mean roughness and violence, the topic asks for it!
I also think that a second season can be made as some questions have been left unanswered. It felt as if four episodes were quite short and the plot could have been extended further. Although some actors may be quite distant, the series seems quite realistic to me, nothing exaggeratedly acted.
In short, I definitely recommend it, it is entertaining and has very good moments. Without forgetting to mention again the magnificent Scottish landscapes.