Episode one looks at one of the most feared child murderers and sex offenders the UK has ever known: Robert Black. In 1990, Black was serving a life sentence in Saughton Prison, Scotland, for the attempted abduction of a 9-year-old school girl, but was also suspected of having abducted and murdered other young females.

The confessions of 14-year-olds Kim Edwards and Lucas Markham reveal the shocking justifications for murdering Edwards' mother and younger sister.

After hearing the confessions of Colin Ireland, who murdered five men in two weeks, detectives have been haunted by the cold and calculating detail unlike anything they'd heard before.

When nurse Elizabeth Wettlaufer walked into a police station, she confessed to murdering eight patients with insulin, but explained that she had the ultimate motivator - God.

A confessional interview with Ted Bundy.

Nilsen murdered 15 young men, whose bodies he sought to preserve as companions before dismembering their remains for disposal down the toilet.

Few serial killers have divided opinion like Aileen Wuornos. Having gunned down six people, she confessed to her crimes, but a confession could not save her from facing death row.

Two British serial murderers who killed a generation apart, but with a common goal - they killed to achieve an infamy that had eluded them in everyday life.

Examining the case of the murderer Robert Pickton, a pig farmer who killed 49 women before feeding them to his hogs.

A profile of one of the most prolific murderers in US history, Gary Ridgeway, who evaded capture for decades.