The Doll's House, Paperback

Detective Helen Grace is on the trail of a twisted serial killer in this riveting thriller in the -gripping-* international bestselling series.
Ruby wakes up in a strange room. Her captor calmly explains that no one is looking for her. No one wants her. Except him.
When the body of a woman is found buried on a secluded beach, Detective Helen Grace is called to the scene. She knows right away that the killer is no amateur. The woman has been dead for years, and no one has even reported her missing. But why would they? She's still sending text messages to her family.
Helen is convinced that a criminal mastermind is at work: someone very smart, very careful, and worst of all, very patient. But as she struggles to piece together the killer's motive, time is running out for a victim who is still alive...