Grace and Charlie come to blows over which course to take in their investigation, as Grace begins to question the evidence against Corey Baxter.

The detectives delve into Bo-Lin's life and realize she may be caught up in a dangerous crime syndicate, while Corey Baxter torments his new prisoner.

After convenience-store clerk Mani confesses to murdering his boss, Grace and Charlie pinpoint holes in his story and begin to suspect he may be covering for someone.

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