The faction system collapsed, and Evelyn (Naomi Watts), the mother of the fourth (Theo James), became the ruler of the world inside the wall. She used strong and strict armed forces to control the residents inside the wall and did not allow them to cross the line. But Trish (Shailene Woodley) and the fourth did not believe this evil. They firmly believed that the future and hope belonged to the world outside the wall. So, the two led Christina (Zoe Kravitz), Pete (Miles Teller) and Tori (Maggie Q) to break through the siege and finally came to the other side of the high wall. On that side, the Gene Bureau took in Trish and her group. On the surface, the Gene Bureau seemed to be the righteous side, but in fact, its head David (Jeff Daniels) had great ambitions and hid an amazing secret.