ITV go through every step of the police investigation, in a crime described by prosecutor John McDermott QC as one of "demonic savagery". This one-off doc follows lead Detective Paul Withers as he works with his team in the Lancashire Police to uncover the mystery behind the �targeted and ferocious� attack on Hartley. The 90 minute special covers the entire story up until the conviction of killers Sarah Williams and Katrina Walsh.

Starring:

Suranne Jones, Charlotte Hartley, Sadie Hartley, Richard Holmes, Bryony Midgely, Katrina Walsh, Sarah Williams, Paul Withers

Genre:

Documentary