A series of brutal, professional executions across North Wales and Stockport forces an undercover operative into a dangerous alliance with a disgraced detective. Marie Donovan must navigate a web of criminal syndicates and internal police corruption to identify a hitman who is systematically eliminating targets. Working alongside DI Jack Brennan, she faces the constant threat of betrayal from both the criminal underworld and her own superiors. The narrative follows their investigation as they realize they are being manipulated in a larger, lethal game, eventually shifting the focus of the killer toward Marie herself.

This novel presents a classic procedural framework that relies on the tension between two reluctant partners forced into a high-stakes investigation. The premise suggests a focus on the mechanics of police corruption and the vulnerability of those operating within the shadows of the law. Readers likely encounter a narrative that prioritizes rapid pacing and the constant threat of exposure over character-driven introspection. The story structure points to a traditional thriller experience where the protagonist's isolation serves as the primary engine for suspense.