This book starts at the erudite head quarters inside of the city. The setting then changes to a rundown city with worn down buildings and inactive railroads. The setting from there then changes into a well designed building in the middle of nowhere.
In the book Allegiant the main character is Tris. Tris's original name is Beatrice but when she joined dauntless she changed her name to Tris. Tris is also in a relationship with Four another character in the book.