Rob Rinder visits HMP Dartmoor in Devon and explores its fearsome reputation built over centuries. He examines what happens when a brutal regime pushes prisoners to their limit.

Rob Rinder explores the story of capital punishment in Britain at Shrewsbury Prison in Shropshire. It's where the reign of Britain's most infamous dynasty of hangmen, the Pierrepoint family, who led hundreds of prisoners to their death, began.

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.