Chicago, society is divided into five factions, each dedicated to the cultivation of a particular virtue. On an appointed day of every year, all sixteen-year-olds must select the faction to which they will devote the rest of their lives. For Beatrice, the decision is between staying with her family and being who she really is - she can't have both. During the initiation that follows, Beatrice renames herself Tris and struggles to determine who her friends really are. But Tris also has a secret.