Things are getting serious.
Tris and her group managed to reach the Amity’s place and for the moment they are safe. But Chicago is in war, Dauntless and Erudite defeated Abnegation (Tris’ former fraction) and the survivors flee to Amity. Candor, responsible for the law, are in a difficult situaiton now and Tris and her friends have to flee, fight and hide all the time. During the books, all the secrets of the characters are told and the relationships are put to the test.
The story is very dark and Tris is about to loose friends and alliance. Because of the war, nobody can feel safe anymore. But Tris also starts new friendships with interesting characters who left Erudite. Also the relationship between Tris and her brother Caleb turns out to be kind of rollercoaster.