In The Boy in the Striped Pyjamas a family moved to live beside Auschwitz when the husband and father was made Kommandant of the camp. Bruno, the younger child, struck up a friendship with a boy on the other side of the wire. This sequel follows Gretel, his sister. After her father was executed in the Nuremberg trials, she and her mother fled from Poland to Paris where they tried to make a new life. Now in her nineties, Gretel lives in a luxury block of flats in London, where she keeps a low profile until a family move in downstairs and she's faced with the terrible dilemma of saving a young boy from violence, at the risk of having her own identity and past exposed - which would cause a global scandal.