4 1/2 stars. Unique world building and interesting concept of dividing the city population into 5 groups according to personality inclination.. At the age of 16 each student takes an aptitude test to see which faction that is best suited for them. It is frowned upon when your child chooses a faction different in which they were raised, but some chose to transfer. Beatrice makes the choice to transfer and is thrown into the training and initiation process of adapting to the tougher faction she chose. While she is struggling to survive her new faction a larger problem brews with the entire faction system and the teenagers are forced to grow up even faster.