The Detective - Meet Jo Birmingham is a single mum, streetwise detective, and spiky as hell. Recently promoted, she is one of the few female detective superintendents on the Dublin police force. But with a failed marriage behind her and two young sons at home, trying to strike the right work-life balance has run her ragged. The Serial Killer - When Jo identifies the missing link in a chain of brutal killings, she comes under fierce scrutiny from her male colleagues in the force, especially her boss and ex-husband Dan Mason. But as the body count rises, so do the body parts. As fear stalks the city, it soon becomes obvious both to the police and to the media that a serial killer is at large. A Terrifying Game of Cat and Mouse - And so Jo embarks on a terrifying psychological journey to find out who the killer is, and how he is choosing his victims. Soon she is involved in a deadly game in which there are no rules. Because the killer is waiting for her.