A serial killer terrorizes the city of Bradfield, leaving a trail of mutilated victims that forces a clinical psychologist and a detective into an uneasy partnership. Tony Hill, a specialist in criminal profiling, must navigate the complex psychological landscape of a predator who leaves no obvious patterns behind. Working alongside Detective Inspector Carol Jordan, Hill attempts to decode the killer's motives while the city descends into a state of panic. The narrative follows their investigation through a tense, methodical process, highlighting the friction between traditional police work and psychological analysis.

This work is widely regarded as a foundational entry in the modern British psychological thriller genre, noted for its clinical precision and dark thematic depth. Readers and critics frequently highlight the complex, evolving relationship between Tony Hill and Carol Jordan as a primary draw for the series. The procedural elements are often praised for their realism, reflecting the author's commitment to authentic investigative detail. The narrative's ability to maintain suspense while exploring the darker impulses of the human psyche remains a central point of discussion among fans of the genre. The book is frequently cited for its influence on the procedural format, setting a high standard for character-driven crime fiction.