Levi Bellfield was found guilty on 25 February 2008 of the murders of Marsha McDonnell and Amélie Delagrange, and the attempted murder of Kate Sheedy, and sentenced to life imprisonment. Chartered forensic psychologist Dr Caoimhe McAnena interviewed Bellfield just after he'd confessed to the murder of Milly Dowler three years later. Having also worked with infamous killers such as Trevor Hardy, Ian Huntley and Mark Bridger, she provides a unique insight into what it takes to make a killer.

A look inside the mind of Robert Black, a predatory paedophile whose disturbing behaviour began when he was just a child himself.

Exploring the dark mind of Stephen Griffiths, the man convicted of murdering three sex workers in Bradford after pleading guilty in 2010. We examine what turned him from a quiet, withdrawn child, into a brutal serial killer.

A deep dive into the life story of Aileen Wuornos, an American serial killer who murdered seven men in a blood-soaked spree which she maintained she did in self-defence.