One choice will change you. What to do if the whole world is filled with lies? What if one revelation - like a single choice - changed everything? What do you do when love and loyalty make you do things you would never do?

The factional society that Tris Prior once believed in is broken. It is destroyed by violence and power struggles, traumatized by loss and betrayal. So when the chance comes to learn more about the world's past than she knows, Tris is ready. Maybe beyond the fence, she and Tobias would find a simple new life together, free of complicated lies, tangled loyalties, and painful memories.

But Tris's new reality was even more disturbing than the one she left behind. Old discoveries quickly became meaningless. Explosive new truths will change the beliefs of those she loves. Once again, Tris must struggle to comprehend the complexities of human nature—and herself—while facing impossible choices about courage, loyalty, sacrifice, and love.