Nobody likes The Complaints—they're the cops who investigate other cops. It's a department known within the force as "The Dark Side," and it's where Malcolm Fox works. He's a serious man with a father in a nursing home and a sister who persists in an abusive relationship, frustrating problems about which he cannot seem to do anything. Then the reluctant Fox is given a new case. There's a cop named Jamie Breck, and he's dirty. The problem is, no one can prove it. As Fox takes on the job, he learns that there's more to Breck than anyone thinks—dangerous knowledge, especially when a vicious murder takes place far too close to home. In THE COMPLAINTS, Rankin proves again why he is one of the world's most beloved and bestselling crime writers, mixing unstoppable pacing with the deeper question of who decides right from wrong.

Malcolm Fox and his team are back, investigating whether fellow cops covered up for Detective Paul Carter. Carter has been found guilty of misconduct, but what should be a simple job is soon complicated by a brutal murder and a weapon that should not even exist. A trail of revelations leads Fox back to 1985, a year of desperate unrest when letter-bombs and poisonous spores were sent to government offices, and kidnappings and murders were plotted. But while the body count rises the clock starts ticking, and a dramatic turn of events sees Fox in mortal danger.

Rebus and Malcolm Fox go head-to-head when a 30-year-old murder investigation resurfaces, forcing Rebus to confront crimes of the past Rebus is back on the force, albeit with a demotion and a chip on his shoulder. He is investigating a car accident when news arrives that a case from 30 years ago is being reopened. Rebus' team from those days is suspected of helping a murderer escape justice to further their own ends. Malcolm Fox, in what will be his last case as an internal affairs cop, is tasked with finding out the truth. Past and present are about to collide in shocking and murderous fashion. What does Rebus have to hide? And whose side is he really on? His colleagues back then called themselves "The Saints," and swore a bond on something called the Shadow Bible. But times have changed and the crimes of the past may not stay hidden much longer—and may also play a role in the present, as Scotland gears up for a referendum on independence. Allegiances are being formed, enemies made, and huge questions asked. Who are the saints and who the sinners? And can the one ever become the other?