DCI Kett's worst nightmares have finally come true, the mysterious group known as Hollenbeck have resurfaced. After being violently abducted, Kett wakes inside a labyrinthine warehouse with no apparent way out - a warehouse rigged with deadly traps. And he's not alone in here. Forced to become a rat in a maze, Kett must use every skill he has if he wants to escape. But there is a far greater price to pay if he ever wants to see his family again. On the outside, DI Porter, DC Savage and PC Aaron Duke face a race against time to locate Kett before it's too late. But Hollenbeck are smart, and this case may prove too much even for the Extreme Crime Task Force. Because Kett is in hell, and he's about to come face to face with the greatest evil of them all.