No one knows what happened to the woman in apartment 12A. Until now. When troubled teacher Emily Swanson moves to London she makes a chilling discovery. The woman who used to live in her new home has vanished without a trace.
Nicola Connolly is a nurse. She is also a serial killer. She kills neatly, three victims every six months, moving around the UK, hiding in plain sight. Everything goes according to plan until she moves to Bath. Because in Bath the police are hunting a serial killer who kills and tortures his victims.