The faction-based society that Tris Prior once believed in is shattered-- fractured by violence and power struggles, and scarred by loss and betrayal. When offered a chance to explore the world past the limits she's known, Tris is ready. But, will she be prepared to face impossible choices about courage, allegiance, sacrifice and love?

In a universe that segregates beings based on the weight of their souls into upper realms of peace and lower realms of strife, three teenagers join a rebel group defying the powers that be by bringing aid to the inhabitants of the lower realms.

As Laterre stands on the brink of war, Marcellus, Chatine, and Alouette must rush to stop The General from gaining access to a weapon that would mean complete control of the planet.