Allegiant by Veronica Roth
Spoilers from the first two books in the series
The third and final book in the Divergent series has Tris and Tobias' world crumbling apart. The factionless and Tobias' mom have taken hold of the city but some folks aren't too happy that factions have been banished. Tension starts to grow between these two groups and Tris and Tobias decide they must leave the city. Once they leave, they learn all about the purpose of the city and Tris even learns more about her mom. However there is tension here too and it seems that these two worlds are set to collide.
This book felt a bit forced, like Roth was trying to come up with enough content for the third book. There were also some consistency issues. Tris and Tobias should not have know about the existence of some items outside of their city but they didn't seem to question everything they should have.
There was also a big spoiler given in the way this book was written. The past two books were written only in Tris' view. This one is in both Tris and Tobias' view, from which I made some conclusions pretty early in the book that were accurate.
This was not the best way to end the series, but overall the book was ok.