'The Complaints"- they're the cops who investigate other cops. Malcolm Fox works in the Complaints and Conduct department, so he's not a popular man. He's just had a result, and should be feeling good about himself. But he's got problems of his own.
Now Fox is given a new task. There's a cop called Jaimie Breck, and he's "dirty". The problem is, no one can prove it. Fox takes on the job, and learns that there's more to the Breck case than anyone thinks. This knowledge will prove dangerous, especially when a vicious murder intervenes far too close to home for Fox's liking.