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 for 26 days
Professor Wilson investigates killer Stephen Griffiths.
Available for 12 days
Could Milly Dowler's killer be linked to two further crimes?
Available for 5 days