The brand new John Rebus thriller from the iconic number one bestseller Ian Rankin: one of the must-read books of the year. John Rebus spent his life as a detective putting Edinburgh’s most deadly criminals behind bars. Now, he’s joined them … As new allies and old enemies circle, and the days and nights bleed into each other, even the legendary detective struggles to keep his head. That is, until a murder at midnight in a locked cell presents a new mystery. They say old habits die hard … However, this is a case where the prisoners and the guards are all suspects, and everyone has something to hide. With no badge, no authority and no safety net, Rebus walks a tightrope – with his life on the line. But how do you find a killer in a place full of them?