John Luther has an extraordinary clearance rate. He commands outstanding loyalty. And yet he seethes with a hidden fury that at times he can barely control. Sometimes it sends him to the brink of madness, making him do things he shouldn't; things way beyond the limits of the law.
This is the story of the case that tore Luther's personal and professional relationships apart and propelled him over the precipice. Beyond fury, beyond vengeance. All the way to murder...