Blue grew up in the Black House. In remotest Wales, Joseph Carillo recruited young, lonely women to join his community and adopt his erratic views. Blue's mother was one of them. But when the Black House goes up in flames, Blue escapes to freedom and never stops running. Twenty years later, when Blue's old dormmate commits suicide, Blue receives a strange call. She has been awarded sole custody of Natasha's daughter. But things don't add up. The girls haven't spoken since the night of the fire. As Blue begins to dig into Natasha's life, her suspicions take her all the way back to that fateful night...But will the truth help Blue to face her past, or will it put everyone she holds close in danger?