A serial killer thriller told in reverse, unravelling the truth behind a series of murders as DCI Gabriel Markham hunts down a brutal killer.
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 comes face to face with the prime suspect in the serial murders, but his deep and personal connection to the case could see him 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.
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.
An unexpected tip off convinces Gabriel and his team to launch a risky mission designed to catch the killer in the act. But as pressure mounts from all sides, Gabriel begins to push away those closest to him. When Gabriel publicly denounces the acid murderer during a press conference, the killer's sights turn towards him and the tension ratchets up as the hunter becomes the hunted.
Meanwhile, Elaine confronts the demons of her past. As the dark, hidden lives of those closest to him begin to be revealed, Gabriel is forced to face up to his changed self and the indelible mark left on him by the killer.
Struggling to cope with the effect this case has had on his life, Gabriel swears renewed investigative vigour. However, just as he does, Gabriel uncovers a shocking secret that cuts straight to the heart of his family.
As Gabriel indulges in reckless, self-destructive behaviour that could jeopardise everything, he is blind to the possible consequences of the life that he is leading. The casual cruelty of Gabriel's vanity is exposed, and his relationships come under more strain.
Meanwhile, the team have to face up to the fact that they have a serial killer on the loose and begin the hunt in earnest. As Gabriel sets his sights on tracking down the first suspect, Elaine makes a difficult decision to revisit her past. Finally, while tracing the journey of the first victim's final steps, the identity of the killer is unmasked.