Today is the day Ivy Moxam escapes from the cellar, her prison for the last 13 years. After she makes a desperate 999 call from a phone box, Ivy is picked up by the police and taken to be interviewed.

Recent events put more pressure on Ivy to relive her ordeal. Ivy is soon summoned back to the police station as Merchant comes up with a bold suggestion for jogging Ivy's memory.

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 arrested and questioned when a gruesome discovery is made at Colbridge Road. She goes into shutdown and it's up to Christina to set Ivy free from the guilt that burdens her.

Ivy is forced to face the truth of what happened to her. She must decide whether to give in to the past, or fight for the future. Can she ever truly be free?