Book excerpt: NGO worker Audrey Clare, sister of Esa Khattak's childhood friend, is missing. In her wake, a French Interpol Agent and a young Syrian man are found dead at the Greek refugee camp where she worked. Khattak and Sergeant Rachel Getty travel to Greece to trace Audrey's last movements in a desperate attempt to find her. In doing so, they learn that her work in Greece had strayed well beyond the remit of her NGO... Had Audrey been on the edge of exposing a dangerous secret at the heart of the refugee crisis - one that ultimately put a target on her own back?