In February 2008, Steve Wright is sentenced to life for the murder of five women who worked as prostitutes; his brutal crime spree lasted just three months, and the judge sentencing him recommended that he should never be released from prison.

Professor David Wilson focuses his investigation on Peter Tobin; tobin was convicted of murdering three young girls in 1991 and 2006; however, reports suggest he has boasted of killing at least 48 people.

In October 2011, Robert Black is sentenced to life in prison for the murder of a 9-year-old girl, a crime he committed in 1981; Black was already serving three life sentences for three other child murders committed during the 1980s.

Levi Bellfield is currently serving time for the murders of 13-year-old Milly Dowler, French student Amelie Delagrange and Marsha McDonnell, and the attempted murder of Kate Sheedy; linking him to further crimes proves complicated.

Professor David Wilson asks when Stephen Griffiths' killing cycle began and whether he was responsible for more deaths than those that are already known.

Professor David Wilson investigates the gruesome crimes and twisted mind of Rachel Nickell's killer Robert Napper, who was finally unmasked by DNA evidence.