IN THERE, YOU CAN'T GO ANYWHERE.

John Rebus spent his life putting Edinburgh’s most dangerous criminals behind bars. Now he has become one of them. As new allies and old enemies close in on him and days and nights blur together, even the legendary inspector struggles to keep his composure. Until a midnight murder in a locked cell brings a new mystery. They say old habits die hard…

But this is a case where both inmates and guards are suspects, and everyone has something to hide. Without his badge, without authority, and without a safety net, Rebus is walking a tightrope on the edge. But how do you find a killer in a place full of criminals?