For Inspector Esa Khattak and Sergeant Rachel Getty, the Syrian refugee crisis is about to become personal. Esa's childhood friend, Nathan Clare, calls him in distress: his sister, Audrey, has vanished from a Greek island where the siblings run an NGO. Audrey had been working to fast-track refugees to Canada, but now, she is implicated in the double-murder of a French Interpol agent and a young man who had fled the devastation in Syria. Esa and Rachel arrive in Greece to a shocking scene, witnessing for themselves the massive fallout of the Syrian war in the wretched refugee camps. Tracing Audrey's last movements, they meet some of the volunteers and refugees - one of whom, Ali, is involved in a search of his own, for a girl whose disappearance may be connected to their investigation. The arrival of Sehr Ghilzai - a former prosecutor who now handles refugee clains for Audrey's NGO-further complicates the matter for Esra, as his feelings towards her remain unresolved. Working against time, with Interpol at their heels, Esra and Rachel follow a trail that takes them from the beaches of Greece, to the Turkish - Syrian border, and across Europe, reaching even the corridors of power in the Netherlands. Had Audrey been on the edge of a dangerous discovery, hidden at the heart of this darkest of crisis - one which ultimately put a target on her own back?