An ambulance officer is stabbed to death by a kid in an drug-induced rage. Detective Sonny Koa delivers the news and bonds with the victim's family. The mother of the deceased extracts a promise from Koa: she wants her son back, in one piece, for burial. Meanwhile, the mystery surrounding the dead NSO agent deepens.

A trip to Canberra with the widow of the murdered NSO agent leads Malik face-to-face with an old foe. But his absence from Major Crime causes problems as the squad investigates a mysterious crossbow killing. Inspector Wright juggles professional and personal problems, as her own brother is the target of a hitman.

Inspector Wright and the Major Crime team unite to track down the men behind the attempt on her brother's life, at the same time trying to prevent Wright's father from seeking vigilante justice. Meanwhile, a respected transplant surgeon is murdered. Malik's wife, fed up with his obsession with work, makes a startling decision.