Four victims. Killer caught. Case closed... Or is it?

Christopher Masters, known as «The Roommate Killer», strangled three women over a two-week period in a London house in November 2012. Holly Kemp, his fourth victim, was never found.

Until now.

Her remains have been unearthed in a field in Cambridgeshire and DC Cat Kinsella and the Major Investigation Team are called in. But immediately there are questions surrounding the manner of her death. And with Masters now dead, no one to answer them.

Did someone get it wrong all those years ago? And if so, who killed Holly Kemp?