Zane Malik is working with National Security's Richard Skerritt to track down the car bomb killers. The prime suspect is a Lebanese businessman, Akmal. He's suspected of being an arms dealer, but the only way to get the truth is to get inside. Malik agrees to go undercover, leaving a gap in the Major Crime investigative unit.

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.