They thought they were safe. They were wrong. The murder of a young prostitute and a baby found abandoned on the same winter night signals the start of a disturbing investigation for Detective Kim Stone – one which brings her face to face with someone from her own horrific childhood. As three more sex workers are murdered in quick succession, each death more violent than the last, Kim and her team realise that the initial killing was no one-off frenzied attack, but a twisted serial killer preying on the vulnerable. At the same time, the search begins for the desperate woman who left her newborn baby at the station – but what looks like a tragic abandonment turns even more sinister when a case of modern slavery is uncovered. The two investigations bring the team into a terrifying world of human exploitation and cruelty – and a showdown that puts Kim’s life at risk as shocking secrets from her own past come to light.