Tris and Four became outlaws like game in a flash. With nowhere quiet and safe, the leader of the Sith section, aided by an armed section of the Dauntless, relentlessly pursues them, determined to get them at any cost. At the same time, she has other divergent people caught who don't fit into the established social system. She subjects them to cruel tests to uncover the right person who can help her unravel an ancient mystery. Tris and Four find they have more allies than they thought, decide to stop running and try a surprise counterattack. It is Tris who becomes the key to the secret that underpins the world they live in. Secrets of the past and the future.