2nd Period Language Arts discussion

Roth, Veronica. Divergent. New York: Katherine Tegen, 2012. Print.

My book is of the genre fiction and adventure.
What I liked about the authors writing style is that you can easily visualize what's going on in the story, it paints a picture in your mind.
The setting of the story begins in the main characters (Beatrice) house, her mom is cutting her hair and she's getting ready to go find out what her faction is. Factions are basically groups that everyone gets put into based on their traits and attributes. The author does a good job of starting the story off fast and getting the readers attention.

So the book sounds kind of interesting, but the summary doesn't really shed any light on the actual contents of the book, other than getting haircuts and being placed in a group. What is the book about a little more in depth?