DCI Gabriel Markham and his team are working to find a serial killer when a break in the case leads them to a potential culprit. Gabriel is torn between his conviction that they already know who the killer is and the seemingly irrefutable evidence found at the last murder scene.

Gabriel comes face to face with the prime suspect in the serial murders, but his deep personal connection to the case could risk jeopardising his career. As a dangerous game of cat and mouse ramps up to a shocking climax, Gabriel begins to lose control.

Gabriel and the team are dealing with the fact that another body has been discovered, seemingly the work of the serial killer. Questions are raised about Gabriel’s suitability to be leading this case, and the rest of his team have to step up to the plate when he's called away on a personal mission - one that strikes at the heart of his family.