Britain’s jails are overflowing. More than 87,000 prisoners are currently incarcerated within their walls. For almost all of these prisoners the aim is rehabilitation and release, but a tiny number are deemed so dangerous and depraved, that they will NEVER be freed. This extraordinary group of forty-five men and one woman includes serial killers, torturers, hired assassins and psychotic sadists. In some cases the faces are instantly recognisable – Ian Brady, Denis Nilsen, Rose West. Others are better known by the names given to them by the press – The Suffolk Strangler, the Crossbow Cannibal, The Railway Killer. But many of them you will never have heard of. This series will shine a light on the dark world of some of these killers.