Ivy (Jodie Comer) has a tragic past, she was imprisoned in a cellar for thirteen years. Thirteen years later, Ivy finally escaped from the magic cave and called the police for help. Elliott (Richard Rankin) and her partner Lisa (Valene Kane) accepted the case. I want to get more clues from Ivy's mouth. However, Ivy's testimony still lacks the most powerful support, which is conclusive evidence.
In addition to coping with the police's interrogation, Ivy must also face the darkness in her heart and the distortions and injustices in society. More importantly, she doesn't know how to return to her long-lost family. The disappearance of a ten-year-old girl named Phoebe (Isabel Shanahan) attracts the police's attention, and witnesses point the finger at a man named Mark (Peter McDonald).
