Truth Changer - Truth Seer Trilogy, #3

The past is back to haunt her. A hundred years in the future, Kenyan-born Imara Kalu becomes a fugitive in the city she just saved. She must return to her home and stop a global vote that could destroy the world. The taggers-terrorists obsessed with moral cleansing-move to her home city with a plan to force their ideals on the entire population. They tag innocent citizens with labels that incite anger and fear.
The city soon becomes a breeding ground for mobs and riots. With the help of her friends, Imara seeks to provide refuge for the tagged. But when it comes to saving the world. she might be too late.