Rob goes to Dartmoor, one of Britain's most notorious prisons. What happens when a brutal regime pushes inmates to their limit?

In Shrewsbury Prison in Shropshire, Rob explores the dark story of capital punishment and the origins of a dynasty of hangmen. Together they would go on to lead hundreds of prisoners to their death.

Rob concludes his investigation in Somerset and Shepton Mallet, one of the oldest prisons in the country and custodial home of many petty criminals, once including the notorious Kray twins