Jailed alongside some of Britain's most dangerous criminals including Charles Bronson, Marks' gripping novel describes how he became corrupted from within his role as a prison officer, the transition to becoming an inmate and the lies he had to tell in order to survive the system inside whilst concealing his past.
While many true-crime books focus on the crime and following trial, 'Turning the Screw' takes you deeper into the rabbit hole, giving a brutal insight into the psychological effects and the suffering that incarceration brings.
Raw, controversial and shocking, Marks' takes us on an emotional and tense journey graphically revealing what really goes on behind bars