Darren Sinfield, the most notorious inmate at Lower Marston maximum-security prison, has gone over the wall and is thought to be holed up in nearby Avonford, a decaying town with a squalid underbelly.

The intelligence officer tasked with hunting him down, Declan Rennard, was an Avonford man himself back in the day. But times have changed. He used to know where the bodies are buried.

Now he’s in danger of becoming one of them. To catch a criminal, Dec is going to have to start thinking like one and that means entering his own dark history to engage in a twisted game of cat and mouse with a man who plays it better than anyone. But unearthing the past will lead him into some dangerous places - the brutal world of organised crime, the dirty secrets of the security establishment and an inverted skyscraper under central London that is home to all the stories Britain would rather forget...