Insurgent by Veronica Roth (author)

The new fix for Hunger Games fans! Tris has done terrible things. She can never take them back. They are part of who she is. As a Dauntless, bravery is her business. And that means violence too. Now the factions are at war, and Tris’s family has paid a terrible price. Racked by grief and guilt, Tris falls prey to reckless anger. Yet if she wants to uncover the truth about her world, she must be stronger than ever. More shocking choices and sacrifices lie ahead. They will demand a spirit that is truly Dauntless.