An armed robbery at a convenience shop reveals an infamous killer has returned to Sydney, and Detective Sgt. Grace Gibbs sets out to catch the culprit behind her colleague's murder.
Grace and Charlie find more and more holes in Mani's story as he continues to confess his guilt over Tony Hodge's murder, then the duo makes a shocking discovery.
As Charlie and Grace think they are finally closing in on Tony's elusive murderer, Bo-Lin gets herself entangled in a dangerous crime syndicate while Corey Baxter kidnaps another victim.