This is the movie poster for Captain America: Civil War. The movie is similar to the Divided we Fall book series. They both focus on two sides that are fighting for freedom.
This book is the prequel to the Maze Runner trilogy. I think that it is about how the "flare" was caused and spread. The details in the book that led me to think this is that the title is The Kill Order and On the back of the book it says Exposure, Infection, Transmission, Pandemic, Extiction.