Five days after the assault on the Abnegation faction by Erudite leader Jeanine (Kate Winslet) and her mind-controlled Dauntless soldiers, Jeanine has declared martial law and that the Divergents and those allied with them are the enemy. Among the Abnegation wreckage, Dauntless leader Eric (Jai Courtney) recovers a five-sided box: each side has a faction symbol. Jeanine presumes it contains data from the city's founders and the means to end the Divergence problem. As only a Divergent is capable of opening the box, she orders the capture of all Divergents. 17 year old Tris (Shailene Woodley), Tobias Eaton (Theo James) (also known as Four), Peter (Miles Teller), and Caleb (Ansel Elgort) hide within the Amity compound. Soon after, Eric and his fleet arrive to test all the occupants for Divergence. Peter gives up the group's location as Tris, Four, and Caleb escape and board a train headed into Factionless territory. Four reveals to the Factionless that his real name is Tobias Eaton, whom they have been searching for..