Undercover as Lexie, Cassie finds herself emotionally seduced by the house and Lexie's devoted friends. She and Frank discover the locals in the village hate Whitethorn House and its owners because of what they represent - colonialism and cruelty, with the scars and skeletons of the famine cottages. Furthermore, the inhabitants of Whitethorn House are refusing to sell, blocking plans for a new motorway that would bring jobs to the area.

Meanwhile, Rob is obsessed and distressed by his memories of the day of the disappearances. The only thing he can do is to reach out to Sandra, the rape victim who still lives on the estate. But Sandra denies everything, throwing him out of her house.

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.