When millions of fish start dying off the coast of Hawaii and something is destroying hundreds of ships, the government enlists the Flock--a band of genetically modified children who can fly--to help get to the bottom of the disaster before it is too late.

One choice can transform you -- or it can destroy you. But every choice has consequences, and as unrest surges in the factions all around her, 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. Tris's initiation day should have been marked by celebration and victory with her chosen faction ; instead, the day ended with...