24 hours after he walked away from court a free man, cop killer and gang leader Simon Talbot is found murdered. In his possession; the name of a protected witness from his trial. 

 For DI Hannah Robbins, it's a race against time to find Talbot's killer, and locate the bystander before it's too late.

 But as Hannah delves deeper into the past, she begins to question the integrity of the whole operation. 

Where do you turn when you can't trust the police?