Consider other books written by John Boyne for young people, including Noah Barleywater Runs Away and The Terrible Thing that Happened to Barnaby Brocket.
Consider other age-appropriate books about the Holocaust, including The Book Thief by Marcus Zusak and Number the Stars by Lois Lowry. More advanced students might also consider such books as Night by Elie Wiesel.
Consider other books about disturbing and/or historically significant events from a child's point of view, both those written as children's books, like Christopher Paul Curtis's The Watsons Go to Birmingham, 1963, and those written primarily for adult audiences, such as Emma Donoghue's Room.