DC Cat Kinsella is back and this time she's pitting her wits against a ruthless killer . . . Christopher Masters, known as 'The Roommate Killer', strangled four women over a three-week period in a London house in November 2012. Holly Kemp, his fifth victim, was never found - until now. Her remains have been unearthed in a field in Cambridgeshire and DC Cat Kinsella and the MIT team are called in, but immediately there are questions about her death. Unlike the other victims, Holly wasn't strangled, she'd been shot and dumped. DCI Joanna Dyer, the lead on the 2012 case, lends the team a hand, as does DCI Steele's old boss and mentor, the now retired Detective Chief Superintendent Oliver Cairns. With Masters dead, Cat and the team have to reopen the case and investigate every lead again. Was the original investigation properly handled, or did the media scrutiny mean that Holly Kemp's actual killer has got away with murder?