At the Choosing Ceremony, Tris’s brother transfers to Erudite and she transfers to the Dauntless faction.
On the train to the compound, Tris meets Will, Christina, and Al who become her new friends.
Tris begins faction initiation and learns how to fight and use weapons.
On visiting day, Tris’s mom comes to see her and informs her that the Erudite are planning something, and she needs to go talk to her brother.
Tris follows her mother’s instructions and goes to see her brother. While at the compound, she meets the leader of the Erudite, Jeanine, and learns that they are preparing to start a war with Abnegation.
Tris is attacked by one of her friends who later commits suicide.
The training instructor, Four, and Tris become involved romantically.
Tris goes through the Dauntless initiation ceremony and faces her fears in a stimulation. She places first out of all the other initiates.
Jeanine begins her war against Abnegation. She uses mind control on the Dauntless who she has made her soldiers to fight for her. Everybody but Tris and Four are under the influence of the mind control serum, because of their divergence.
Jeanine discovers that Four and Tris are only pretending to be under her control and she captures them with plans to kill Tris and brainwash Four.
Tris’s mother finds and rescues her daughter, but at the expense of her own life.
After finding the rest of her family, Tris infiltrates the Dauntless headquarters to stop the computer running the mind control program, and save Four from Jeanine’s serum that has manipulated his mind.
As the mind control ends, Four, Tris, and her brother, Caleb, leave on a train to seek refuge at the Amity faction compound.