In the book Allegiant, the characters have changed since the beginning  of the series. Beatrice was a small Abnegation girl who discovered she was Divergent- she could choose any faction to join. After choosing Dauntless, she had to toughen up and fight to survive, because she was facing people who had been in Dauntless their whole lives.

Tobias, a.k.a. Four has also changed since the beginning of the book. Four was an Abnegation child as well when he chose Dauntless. He did this to make sure he would be able to defend himself in later life, and to escape his abusive father. Four became an initiate instructor and eventually fell in love with Beatrice. This made him realize that there was more to life than fighting all the time.

Uriah was a Dauntless initiate that had come from amity, the faction of peace. Uriah always stepped down and let other people do whatever with him, but with help from his brother Zeke and his friends, Uriah learned to step up and fight for what he believes in.

Lately in Farenheit 451, Things have been getting tense, and the future looks hard for Montag. My predictions for the rest of this book are that Montag plants the books in firemen's houses, so they are burnt down, but afterwards he is caught and has to explain that he is innocent. I would rate this book an 8 out of 10 because the plotline seems interesting, but nothing really interesting happenes in the actual book. Ray Bradbury has also written "Martian Stories" and "The Illustrated Man". Ray Bradbury is best known for Farenheit 451 and his science fiction/horror stories that depict a futuristic horror scene.

Other books that are similar to this theme are "The Giver" by Lois Lowry, "Matched" by Ally Condie, and "Hunger Games" by Suzanne Collins. These books all depict a scary, futuristic scenario where the main character breaks free. The end is usually the government getting toppled by rebels.

In Allegiant, there is a massive setting change. Near the beginning of the book, Beatrice and her allies are in the city, trying their best to rebel against the "dictator" Evelyn. The city is a large, circular quarintined area split into five parts, one for each faction. Aquiring help from the force that is trying to restore factions in the city, the Allegiant, Beatrice, Tobias, Claire, Uriah, and few others are able to escape the city and migrate to the real world. Looking around, they see signs of rebuilding from some devestation. As the characters find civilization at a scientific compound, where the leaders of the country try to explain what had happened, they notice that many of the people living there have tensions between each other. Finding this, Tobias ventures to the fringe. The fringe is a desolate place where outcasts and rebels go to live and hide. Exploring the new and dangerous place, Tobias is made aware of a new rebel force against the government,
It is up to Beatrice and Tobias to decide weather to trust these rebels, or to side
with the government in the next part of Allegiant.