The fable by John Boyne follows Bruno, a boy who moves with his family due to his father's new assignment as a commandant, leading him to encounter a friend named Shmuel on the other side of a fence, where they bond despite their contrasting lives. As Bruno learns more about Shmuel's dire situation, he decides to explore the other side, culminating in a tragic ending as both boys meet their fate in a gas chamber. The narrative serves as a poignant reminder of the atrocities of World War II and emphasizes the innocence of children amidst such brutal history.