I have read all three of Alison Bruce's books and whilst I enjoyed the first two, this is undoubtedly the best so far. The author confesses that this was the idea that she had first but wrote the previous two to introduce the characters and develop them. I think she did the right thing and hopefully the series will keep on improving. I will certainly be keeping an eye out for the next one.
The main character is an interesting character, not at all like most policemen in novels. He tends to go off on his own theories and he has a history of delivering the goods but as he is so inexperienced his boss keeps him on a leash which he relaxes or tightens as he feels appropriate. This keeps this interaction interesting and unpredictable and I look forward to seeing how it develops in the future.