When the target of a police investigation is found murdered, Rhys and Sam uncover a web of diamond smuggling, infidelity and workplace corruption. Meanwhile, Priscilla is seduced into a dangerous relationship with an Iraq war veteran, and Finch demands results when a sting operation ends in disaster for the cops.

Roxanne and Dan make a gruesome discovery at a derelict house used for ghost-spotting tours. Sam is forced to admit her true feelings for her jailbird ex, Zac Butler. Graeme's life changes forever when a hit-and-run victim dies.

The cops investigate a gang of ram-raiders they suspect of planning a multi-million dollar heist. Rhys suspects Sam's boyfriend of being the mastermind behind a deadly criminal conspiracy.