The Kill Order (The Maze Runner #4) by James Dashner

A prequel to the New York Times bestselling Maze Runner series - now a series of major motion pictures starring Dylan O'Brien! Make sure you've read The Maze Runner, The Scorch Trials and The Death Cure first. 

Sun flares have unleashed devastation on the earth. Mark and Trina were there when it happened, and against the odds they survived. But now a violent and high contagious disease is spreading like wildfire. Worse still, it’s mutating, and people are going crazy. Mark and Trina will do anything to save their friends - if only they can avoid madness and stay alive... For ages 12+ Format Paperback 352 pages | Publisher Chicken House | Language English | ISBN13 9781909489431