At 6ft 7, Gary Vinter is a convicted double murderer and one of the most feared men in the prison system. He stabbed a fellow inmate in the eye and gave another brain damage.

Exploring the life and convictions of Joanne Dennehy. After serving a short sentence in Peterborough prison, she committed a frenzied knife attack on a man she lured back to her apartment with the promise of sex. Whilst on the run from police, Dennehy proceeded to violently stab and murder two more men over the next 10 days, before stabbing two men out walking their dogs.