Psychologist Dr Caoimhe McAnena interviews Levi Bellfield after he confesses to the murder of Milly Dowler. Having experience working with other infamous killers, such as Ian Huntley, 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.

Explores the dark mind of Stephen Griffiths, the man convicted of murdering three sex workers in Bradford after pleading guilty in 2010.

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.