Allegiant by Veronica Roth

Allegiant is the thrilling ending to the trilogy of Divergent. If you enjoyed the first two books, then this explosive end to the story. Tris and Tobias are back and working harder than ever to fix their falling apart world. When they escape the fence then they're in a whole new world. Here they make new friends, get into new trouble, and get caught up in two major issues. See if you can find the end.