Divergent, Insurgent, Allegiant

Divergent:

The faction-based society that Tris Prior once believed in is shattered—fractured by violence and power struggles and scarred by loss and betrayal. So when offered a chance to explore the world past the limits she’s known, Tris is ready. Perhaps beyond the fence, she and Tobias will find a simple new life together, free from complicated lies, tangled loyalties, and painful memories. But Tris’s new reality is even more alarming than the one she left behind. Old discoveries are quickly rendered meaningless. Explosive new truths change the hearts of those she loves. And once again, Tris must battle to comprehend the complexities of human nature—and of herself—while facing impossible choices about courage, allegiance, sacrifice, and love.
Insurgent:
Tris, Four, Caleb, Peter, and Marcus travel to Amity, where several surviving Abnegation have settled. Amity issues a statement that all factions may seek a place of safety there offering refuge as long as they reside in peace. Erudite and Dauntless traitors arrive at Amity to search for Abnegation members. Tris, Four (Tobias), and Caleb escape by jumping onto an oncoming train full of armed factionless, including former Dauntless initiate Edward,who escorts them to a factionless-safe zone. The group is lead to factionless leader, Four's mother, Evelyn, who was believed to be dead. Tris overhears a conversation between Four and Evelyn, during which Evelyn tells Four that he needs to convince the Dauntless to join the factionless. During this encounter, Evelyn threatens Tris. Caleb moves to a safe zone where more Abnegation are living while Tris and Four travel to Candor headquarters.
Allegiant:
Tris is shocked by the video released to the public at the end of the Erudite headquarters raid. The video revealed the truth about the faction system and announced that Divergent are needed outside the borders of the city.Factionless leader Evelyn Johnson appoints herself leader of the city. She forces citizens to operate under her command and live as equal, factionless citizens. Tris questions Evelyn's motives and is kidnapped by the Allegiant, a rebel group determined to reinstate their old way of life. The Allegiant invite her to a meeting the following night.Tris' brother Caleb is put on trial for assisting former Erudite leader Jeanine Matthews. Caleb's betrayal prevents Tris from forgiving her brother. Caleb was found a traitor and sentenced to execution in two weeks. The Allegiant, led by Cara and Johanna, plan to send a group outside the city to find the truth. Tris volunteers to go on the condition: that Caleb is taken with them.Four, Tris, Christina, Cara, Uriah, Tori, Peter, and Caleb are ambushed after they jump off the train, which results in Tori's death. Driving through the unknown, they meet Zoe and Amar, Four's former instructors who were believed to have been killed for being Divergent. Zoe and Amar take the group to the Bureau of Genetic Welfare.