Allegiant, the third book in the Divergent Series by Veronia Roth

Allegiant, the third book in the Divergent Series by Veronia Roth, opens up with Tris imprisoned for her traitorous actions in the previous book. While she is imprisoned, Tobias is debating what he wants to do. While he wants to support his mother, Evelyn, he also wants to leave the city. Tobias hears that Tris is going to be interrogated, but he knows that she will be able to resist the truth serum and come up with a lie to save not only herself, but Christina and Cara, who were also imprisoned with Tris. Tris lies and says she was manipulated into following orders from Marcus, believing him to have been working with Evelyn. The lie works and Tris and the others are released from prison.
Things in the city are shown to be very chaotic. Riots are breaking out, with the rioters calling for the death of factions. At the end of one riot, Edward is killed. This makes Tobias realize that Evelyn is at fault for taking away everyone’s choice. As a result of the riots, stricter rules are put into effect throughout the city. In the aftermath of the riot, Tris is approached by a rebel group known as Allegiant. Allegiant wants to help Tris and her accomplices escape the city. Before leaving, Tobias rescues Caleb who was going to shortly be placed on trial. The two escape along with Tris and her group.