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.

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.