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. Meanwhile, there are fears that Gabriel's intimate connection to the case may be skewing his professional ability to track down the perpetrator, and his personal relationships continue to impact on his work as he is given an ultimatum to face. The rest of Gabriel's team are dealing with the conflict of their own personal and professional lives as they launch a thrilling, high-stakes operation to catch the killer. But are they targeting the right person? Gabriel makes one final connection in a desperate, last-ditch attempt to get to the truth.

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.

Gabriel's struggle to balance his relationships with the women in his life threatens to jeopardise the safety of his daughter and he finds himself faced with a father's worst nightmare.

Meanwhile, another suspect in the serial killer case emerges. When the truth of the brutal murder is finally revealed it is more shocking than anyone could have imagined.