The strain of playing a happy family is beginning to show, with the Moxam family treading on eggshells around Ivy, unsure of how to react when she drops unsettling hints about her life in the cellar.
Recent events put more pressure on Ivy to relive her ordeal and Carne and Merchant find themselves surrounded by a new team from Scotland Yard.
Ivy is soon summoned back to the police station as Merchant comes up with a bold suggestion for jogging Ivy's memory, while White's car is discovered abandoned.
However, Ivy's behaviour makes Merchant suspicious, and when evidence is produced which suggests that Ivy has lied to the police, she comes under fierce scrutiny. She reaches out to Tim for support, but suffers a shattering betrayal.
