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Reilly and Maddox's working relationship comes under pressure when, in the course of the investigation, elements of their pasts emerge that they would rather forget.
Despite Rob’s promise to Cassie that they won’t investigate Operation Vestal, they make a dark bargain to keep the secret and carry on working on the cases.
All of Knocknaree mourns as Katy Devlin is laid to rest, while the pressure on Rob and Cassie mounts as there are still no arrests in the case.
As Cassie struggles to make sense of Lexie’s life and death, we delve into her own difficult past. Meanwhile, Rob’s past finally yields some results in the Katy investigation.
Rob makes costly mistakes as Cassie immerses herself in the art of being Lexie.
When Cassie immerses herself in a undercover assignment, threats both known and unexpected haunt her every living breath. Rob desperately hunts down one last lead.
Everything comes to a head as Cassie confronts Lexie’s killer and Rob has a breakthrough about Katy’s murder.
The finale finds Rob and Cassie forced into a face-to-face reunion.As arrests are made, Rob and Cassie both come to profound realisations.
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