I'm sorry if he's been mentioned previously, haven't had a chance to work through recently, but Peter Robinson's "police procedurals" are excellent stuff - and there's a lot of them ! Top notch.
Very well written, believable characters, and spot-on details (I was reliably informed by a member of the Met recently), and can be read stand-alone, but as a series even better.
Like James Lee Burke.................... oh, have I mentioned him before ?