“What you've got to understand is that men like him are the aristocracy in here. The armed robbers and contract killers. They're a breed apart.”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 t...