The Complaints, by Ian Rankin

I really enjoyed this detective story by Ian Rankin, the very popular author of the Inspector Rebus novels, set in Edinburgh, Scotland. The Complaints is the first book in a new series, also set in Edinburgh, which focuses on detective Malcolm Fox. He works in the Scottish equivalent of an Internal Affairs department, investigating other police officers for corruption and other crimes. Fox is asked to investigate another officer under suspicion of child pornography, but from the start something doesn't seem right. Fox is tenacious and won't drop his inquiries even after both he and the other officer are suspended. This is a compulsive read that I just couldn't put down.