Real life 'Cracker', Professor David Wilson attempts to uncover the true scale of the crimes committed by some of the country's most notorious serial killers.
David Wilson investigates whether Elizabeth Valad and Brigitte MacClennan were his only victims.
Available until 21:00 4 Apr 2014
Investigating Rachel Nickell's killer Robert Napper.
Available until 21:00 28 Mar 2014
Professor Wilson investigates killer Stephen Griffiths.
Available until 21:00 21 Mar 2014