How is it possible to be more evil than Jimmy Saville? Step forward prison officer and cook Neville Husband, now regarded as the most prolific sex offender in British history. Hundreds of young men were abused by Husband, mainly at a young offenders detention centre outside Durham. How did he get away with if for years before finally being convicted of abusing just five teenagers in 2003? His real tally of misery runs into several hundreds and all the while a blind eye was turned by colleagues and bosses. In this epsiode we also explore what makes a man become a paedophile and has the world changed since Neville Husband was on the prowl 20 years ago.

Police know of at least 12 women who claim to be Madeline McCann, the most infamous of them all, Polish woman Julia Wandelt is about to be deported having been convicted of harassing the McCann family, including Madeline's siblings.

What drives people to believe they are the real deal in the cases of missing persons? Fraudsters, attention seekers or simply mentally ill obsessives who need treatment? This is half an hour of a grown up examination of imposters and the conspiracy theorists who, sadly, may never give up.

How much worse can it get, hundreds of inmates wrongly freed every year from Britain's jails, the latest an Algerian sex offender now at liberty roaming the streets. And this was after new measures introduced to stop it happening again following the embarrassment of the mistaken release of Hadush Kebatu, the Ethiopian illegal migrant who sexually assaulted a 14 year old girl. We have skin in the game, Professor David Wilson is not just a criminologist but was also a prison governor at Wormwood Scrubs and Martin Frizell, broadcaster and journalist lives in the neighbourhood of Wandsworth Prison, scene of the latest scandal. So how do we fix it?