BILLY ALFRETH IS SERVING FIVE YEARS as an inmate at Dellacotte Young Offenders Institute, in the north of England. Billy has memories of being attacked by three men, but CCTV footage doesn’t bear out his account and he is locked up for stabbing one man. Billy’s world overlaps with that of Ronald Dott, a serial rapist, who claims to know Billy from when he was a child, only that is impossible. A...