Insurgent is the sequel to Divergent.

Insurgent: As war surges in the dystopian society around her, sixteen-year-old Divergent Tris Prior must continue trying to save those she loves--and herself--while grappling with haunting questions of grief and forgiveness, identity and loyalty, politics and love.

Divergent: In a future Chicago, sixteen-year-old Beatrice Prior must choose among five predetermined factions to define her identity for the rest of her life, a decision made more difficult when she discovers that she is an anomaly who does not fit into any one group, and that the society she lives in is not perfect after all.