Insurgent

First let me say I'm happy there was no love triangle. Roth showed Tris and Four's relationship have enough to deal with when there world is falling apart. I loved the reader was able to see more of the fractions and factionless. The characters were more developed with personalities becoming more three diminutional do to situation and war. Some lesser characters from book one end up surprising Tris and the reader. The ending made this worth reading.