Tris, Tobias, Caleb, Marcus, and Peter take refuge at the Amity compound after narrowly surviving the Erudite-led attack.

The Amity community votes to remain neutral in the faction conflict and offer shelter to refugees from all factions.

Erudite soldiers and Dauntless traitors raid the Amity compound, forcing Tris and her group to flee.

Tobias announces his identity as Tobias Eaton to armed factionless on a train, and they immediately stand down.

Tris and Tobias are arrested by Dauntless guards upon arriving at Candor headquarters.

Tris injects herself with truth serum at the Candor trial and publicly confesses to killing Will.

Dauntless traitors attack Candor headquarters and shoot people with a new long-range simulation serum.

Tris stabs Eric in the stomach and loyal Dauntless soldiers arrive to take him prisoner.

The loyal Dauntless elect Tori, Tobias, and Harrison as new leaders and vote to return to their compound.

Tobias executes Eric following a Dauntless faction trial for crimes against their people.

Three Dauntless stand on the rooftop under simulation; Marlene falls to her death after delivering Jeanine's ultimatum.

Tris breaks her promise to Tobias and secretly surrenders herself to Jeanine at Erudite headquarters.

Jeanine subjects Tris to repeated brain experiments to develop a simulation serum capable of controlling Divergent minds.

Peter rigs Tris's execution and helps Tris and Tobias escape from Erudite headquarters.

A secret video is broadcast to all factions, revealing the true origins and purpose of their enclosed society.

After surviving the Erudite's massacre of Abnegation, Tris and her group seek refuge first at Amity and then at Candor, where they are put on public trial under truth serum. Dauntless traitors attack Candor on Jeanine's orders, forcing the loyal Dauntless to regroup, elect new leaders, and execute their traitorous colleague Eric. Jeanine's simulation threats escalate until Marlene dies on a rooftop, pushing Tris to sacrifice herself by surrendering to Erudite headquarters. Trapped and subjected to brain experiments designed to break Divergent resistance, Tris endures Jeanine's cruelty until Peter secretly fakes her execution and helps her escape. The novel ends when a secret video is broadcast to all factions, exposing the true origins of their enclosed society and pointing toward a world beyond the fence.

The war's biggest moments from Amity's safe house to the final revelation.

Tris overhears Marcus telling Johanna that Jeanine attacked Abnegation specifically to steal critical secret information.

Tobias confronts Johanna after discovering that Amity secretly mixes peace serum into the communal bread supply.

Most of the surviving Abnegation members are shot and killed as Tris's group flees the Amity compound.

Evelyn warns Tris that she is only a temporary presence in Tobias's life.

Tobias is injected with truth serum at the Candor trial and reveals his true identity as Tobias Eaton.

Under truth serum, Tobias admits he chose Dauntless specifically to escape his physically abusive father Marcus.

Tris finds and rescues a young girl from Eric's grasp during the Dauntless traitor attack on Candor.

Jack Kang announces his intention to negotiate a peace treaty with the Erudite, dismissing Dauntless concerns.

Tobias deliberately beats his father Marcus at dinner in front of the Dauntless to earn their loyalty.

Shauna is shot and permanently paralyzed while the group flees after spying on the Erudite-Candor peace meeting.

The loyal Dauntless destroy Erudite surveillance cameras throughout the city in a large-scale paintball battle.

In a meeting with Evelyn and Edward, Tobias formally agrees to a Dauntless and factionless alliance.

Christina forgives Tris for killing Will after witnessing a simulation force Dauntless members off a rooftop.

Jeanine reveals to Tris that her own brother Caleb exposed her three-faction Divergent aptitude to Erudite.

Lynn is carried into the lobby with a fatal stomach wound and dies shortly after.

While sheltering at Amity, Tris learns that Jeanine attacked Abnegation to steal secret information, and Tobias exposes Amity's hidden use of peace serum in the communal bread. The violent escape from Amity costs most surviving Abnegation members their lives, and the group is soon pulled toward the factionless, where Evelyn attempts to drive a wedge between Tris and Tobias. At Candor, both Tobias and Tris undergo public truth serum trials that expose their deepest secrets, while Tris saves a child during a brutal Dauntless traitor raid. The faction war sharpens as Kang's cowardly peace overture forces the Dauntless to act independently, building their own alliance with the factionless while Tobias consolidates leadership through calculated public action. The closing stages of battle bring devastating losses — Shauna's paralysis, Caleb's full betrayal, and Lynn's death — before Evelyn dismantles the faction system entirely.

The secondary battles, revelations, and alliances that shaped the faction war.

Tris reveals to Caleb that she is Divergent with aptitudes for Abnegation, Erudite, and Dauntless.

Tobias tells Tris that he has known for about a year that his mother Evelyn is alive.

Evelyn tells Tris that her father was born into Erudite and was once Jeanine Matthews's childhood friend.

Christina turns away from Tris after hearing under truth serum that Tris shot and killed Will.

Tris contemplates suicide alone in the Candor interrogation room but stops herself, resolving to honor her parents' sacrifice.

Tris and Tobias argue bitterly over their mutual failures of trust — his hiding Evelyn's survival and hers hiding Will's death.

Tobias tells Tris that his fear landscape has changed and now centers on being powerless to save her.

Jeanine administers a fear serum to torture Tris while Tobias watches, forcing him to reveal factionless safe house locations.

Tris defeats Jeanine's final simulation attempt and physically attacks Jeanine, punching her and scratching her face.

Marcus tells Tris her mother died specifically to retrieve the secret file from Jeanine, not only to save Tris.

Tris secretly decides to help Marcus protect the hidden information and lies to Tobias about sitting out the battle.

Fernando is shot and killed as the group sneaks into Erudite headquarters through upper-story windows.

Tori kills Jeanine before Tris can stop her, preventing Tris from accessing Jeanine's laboratory computer.

Tobias finds Tris in Jeanine's lab alongside Marcus and accuses her of betrayal for working with his father.

Evelyn announces the immediate disbanding of the faction system while the factionless hold all the weapons.

Tris's hidden Divergent nature — spanning three factions — is revealed to Caleb early on, while uncomfortable truths surface about family: Tobias's mother is alive among the factionless and Tris's father was secretly born into Erudite. At Candor, truth serum forces a painful reckoning as Tris's confession about Will shatters her friendship with Christina and triggers a deeper crisis of guilt and suicidal thoughts, followed by a bitter argument between Tris and Tobias over their mutual deceptions. Betrayal escalates when Caleb is exposed as Jeanine's informant, and Tobias is tortured into revealing factionless safe houses while watching Tris suffer under a fear serum. Tris's secret decision to help Marcus protect the hidden video file — lying to Tobias and placing herself back in danger — represents her most consequential act of defiance against both Erudite and the factionless plan. The final confrontations in Jeanine's lab expose the cost of every hidden secret, as Tori kills Jeanine, Tobias accuses Tris of treason, and Evelyn seizes the moment to disband the factions entirely.