Whole trilogy
The Divergent trilogy starts in a dystopic Chicago where people are divided into 5 factions that represent their character. Around their 16th birthday, the teenagers need to choose their faction. To help them choosing, they take a test that places them in one or the other factions: tehy can stay in their family faction or be transferred in another that would match them better. Tris' results are rare and somewhat inconclusive: the test puts her in three factions at a time. Tris chooses to be transfered from Abnegation to Dautless. The first book describe her initiation in this faction (which is not easy). The following books tell about the society's evolution, including, in the third book, why and how the society was formed.. A pretty nice trilogy overall, I may go watch the movies.