It begins with a bang - a routine search warrant and patrolman Emo Rojas is blown away. The shooter is a wannabe cop with an illegal arsenal. But he's not the only one making the LAPD's enemies list: ATF agents may have known Rojas was walking into a trap. Now the LAPD wants revenge. A clandestine war between the two agencies has begun and it's already claimed two more victims, an ATF member and an L.A. sheriff, both taken out by snipers. The investigation into the murders is handed to homicide investigator Shane Scully, an honourable man now isolated between two hostile armies. As the payback for Rojas's death escalates, Scully and his wife - and boss - Alexa are swept up in a political firestorm that's burning everyone it touches. With time running out, and no one to trust, Scully is putting his career, his life, and the lives of everyone he loves on the line. But crossing it is the only way he can get to the truth.