A hundred years ago, wars sweeping the world wiped out almost all countries from the face of the earth, and the surviving humans gathered in dilapidated Chicago. In order to seek permanent peace, the founders of the new world divided the survivors into selfless, honest, fearless, friendly and knowledgeable. Each faction has its own specific social responsibilities, and they work together to promote the progress of the world. Beautiful girl Beatrice (Shailene Woodley) was born into a selfless family. Like other people her age, she will decide which faction she will belong to for life at the age of 16. However, the test showed that she was an extremely rare dissenter. Beatrice ignored the test officer's dissuasion and resolutely chose the fearless faction. In this warrior's group, she and her partners must undergo the most rigorous training. And the secret she keeps will also become an important factor that affects her life...