In this chilling crime thriller, a police officer discovers a psychopath, but learns that his actions are even more terrible than imagined.

It's 2:00 a.m. in Glasgow. DI Rachel Narey and her team of cops are standing outside the door of a violent rapist. At her word, the officers break down the door and charge into the flat. They find the man, Robert Broome, cowering in a corner of his bedroom, pleading not to be arrested, begging to be left alone.

Once he is arrested, Narey's team searches the flat. In a hidden recess under the carpet, they find photographs--hundreds of them. All of women, and most without being aware the photos were taken--on the street, in playgrounds, in shopping centers. Narey studies them, seeing the same faces repeated. She suddenly realizes that Broome is a repeat offender, and the scale of what he might have done terrifies her.

But even with Broome in custody, these women are still somehow being hunted and killed. The clock is ticking, the police are way behind, and the stakes have just gotten higher.