The Boy in the Striped Pyjamas

John Boyne's pair of novels set around the Holocaust, told from inside a Nazi commandant's family. The Boy in the Striped Pyjamas (2006) follows nine-year-old Bruno, whose family moves beside a concentration camp his father commands. All the Broken Places (2022), a direct sequel per the publisher, picks up decades later with Bruno's older sister Gretel, now elderly and living in London, confronting the past she has spent her life avoiding.