"Allegiant" is the third and final book in the "Divergent" trilogy, written by Veronica Roth. The trilogy is set in a dystopian future Chicago where society is divided into five factions based on personality traits. The story follows the protagonist, Beatrice "Tris" Prior, as she discovers she is Divergent, meaning she possesses qualities of multiple factions. In "Allegiant," Tris and her allies uncover the truth about their society and the world beyond the walls of Chicago. They learn that their city is actually an experiment conducted by the government to fix the genetic damage caused by past generations. As the truth unfolds, Tris and her friends must make difficult choices about loyalty, sacrifice, and the future of their society. The novel explores themes of identity, belonging, and the consequences of power. It delves into complex moral questions and challenges the characters to confront their beliefs and values. "Allegiant" concludes the story of Tris and her companions in a gripping and emotional finale.