Allegiant

After Evelyn forbids any citizen from leaving, she announces that all Erudite members involved in the previous coup attempt are to be put on trial and executed if found guilty. Tris and Four rescue Caleb from execution and try to escape over the wall, along with Tori, Peter, and Christina. Edgar ambushes the group and kills Tori, but the group escapes and passes the wall. However, soldiers with advanced weaponry intercept the group and take the members to the Bureau of Genetic Welfare, a city of advanced technology that is hidden behind a cloaking shield. After undergoing decontamination, the group learns that years ago, the UN believed that society's problems were caused by "damaged genes". Attempting to create a better society, it began to alter people's genes, which eventually led to the Purity Wars that destroyed most of the planet. To try to reverse the destruction, a series of "experiments" was set up in an attempt to repair the mistake, which established isolated cities across the remains of the world.