Ella Williams is ten years old. She loves her granddad and her sister and her shiny new red shoes. She's just been abducted by a killer - someone who kidnaps young girls, holds them for a few weeks then returns their bodies clothed in white foundling dresses. The crimes are clearly linked to notorious child murderer Louis Kinsella, locked away in a high-security hospital. Is it a copycat? Or is he giving someone direct orders from behind bars? To save Ella's life, psychologist Alice Quentin must form a relationship with Kinsella. But he is slow to give up his secrets, and all the while, time is running out...