Two films and numerous books have attempted to tell the shocking story of two of Britain's most ruthless gangs. Eventually torn apart by greed and paranoia, the gang members became victims of their own vile trade and hate-filled actions.

Previously published as Becky, this is the heartbreaking story behind the murder of 16-year-old Bristol schoolgirl Becky Watts, a crime that shocked the nation and tore a family in two.

In 1994, Robert Black was convicted of the kidnapping, sexual assault and murder of four young girls, and sentenced to life imprisonment with a minimum tariff of thirty-five years. He died in HMP Maghaberry, Northern Ireland, in January 2016, aged sixty-eight, unmourned, and entirely unrepentant of his repellent crimes.