
Examining some of the most dangerous and prolific murderers in the UK and worldwide.

Fred and Rose West rape, torture and kill young women in their house of horrors, including their own daughter; between them, they murder 12 girls; interviews with investigators including Chief Constable Tony Butler.

A look at the London serial killer Dennis Nilsen, who murdered at least 12 men before being caught.

Levi Bellfield was already in prison when he was found guilty of murdering Milly Dowler.

A chilling look at Stephen Griffiths, who in 2009 viciously murdered three women.