When Sky and her older sister Avril were taken into care, the social workers knew this was a case like no other. Raised by troubled parents who hoarded compulsively, creating horrific conditions no child should live in, the two girls arrived at foster carer Louise's home, neglected, malnourished, and indoctrinated. Louise had to draw on all of her experience as one of Britain's leading foster carers to rehabilitate and change the course of their lives.

But with constant attempts to thwart her work, Louise ends up under siege in her own home. Will she succeed or is their fate sealed forever?