An innocent man framed. A case closed. A serial killer free to kill again.

It is 1985. Detective Inspector Mungo 'Bob' Willis is being forced out of Avon and Somerset Police on medical grounds. His career is in tatters, his body broken, his mind shattered, and his partner--DS Lizzie Harper--dead in a sting operation gone wrong.

Their last case is closed, but Bob is convinced an innocent man has been framed, leaving a serial killer cruising the A303 with impunity, free to target lone women who have broken down by the roadside late at night.

The killer knows the police aren't looking for anyone else in connection with the murders. What they don't know is what Bob will do next.

And when another woman is killed in horrifyingly similar circumstances, Bob launches his own--unofficial--investigation. Can he stop a sadistic killer before they kill again? And again...