A suburban printer is killed in a car bomb attack. Is this the work of Muslim extremists? Or is it a criminal act? As Detective Zane Malik of Major Crime links up with National Security to search for the truth, the news of the bomb hits the media, and there is fallout in the community.

The Major Crime and NSO investigation into the car bomb deaths results in Malik going undercover to track a possible suspect. While he is undercover a Chinese student is discovered murdered. Detectives Lim and Callas get to the bottom of an extortion ring.

Akmal is killed in prison. Malik is determined to find out the truth behind his murder and the murder of NSO agent. Going to Canberra with the widow of the NSO agent leads Malik to an old foe. But his absence causes problems when the squad investigate a mysterious crossbow killing. Inspector Wright juggles professional and personal problems, as her own brother is the target of a intended hit.

The shooting of Inspector Patricia Wright’s brother unites the team at Major Crime. Can they bring the killers to justice? While the detectives gather together to help their boss, a respected transplant surgeon is murdered. Malik’s wife, fed up with his obsession with work, leaves with their children.

Major Crime and NSO unite once again as a terror attack looms as a real possibility. Detective Zane Malik uses everything in his power to discover the conspirators and in doing so finally finds out why Agent Angleton was killed.