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.

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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.