Disillusioned D.I Wallace Hammond is unconvinced when his retired commanding officer DCI Lloyd Harris, seeks Hammond's help to investigate a series of dubious suicides.

Before he can identify whether there is any truth in Harris' suspicions, Hammond must make a connection between the victims. Then there is another death and Harris goes missing.

As Hammond follows a trail of deceit, he becomes an unknown's killer's fixation. Now he is on a one man's crusade to catch the killer before he is the next victim; playing the hunter as well as the hunted in a terrifying game of corruption and murder.