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.
Charlie and Grace come to blows over which course to take when they investigate the second murder of the week; Grace finds it hard to ignore Charlie's intuition despite all the evidence pointing to involvement by Corey Baxter.