When an armed robbery reveals that a cop killer is back in Sydney, Detective Grace Gibbs has the chance to finally catch her colleague’s murderer.

After Mani confesses to murdering his boss at the convenience store, Grace and Charlie pinpoint holes in his story.

The detectives delve into Bo-Lin’s life and realize she may be caught up in a dangerous crime syndicate.

Grace and Charlie come to blows over which course to take in their investigation but decide to follow their instincts, hoping to catch the killer.