The Scorch Trials (The Maze Runner Book 2)

Solving the Maze was supposed to be the end. No more puzzles. And no more running. Thomas was sure that escaping meant he would get his life back. But no one knew what sort of a life they were going back to... Burned and baked, the earth is a wasteland, its people driven mad by an infection known as the Flare. Instead of freedom, Thomas must face another trial. He must cross the Scorch to once again save himself and his friends.