The world has ended: the earth is scorched, and fever rages through the population. Out of the chaos, a boy emerges with the power to change everything: Thomas. This is the start of his story. An electrifying Maze Runner prequel, The Fever Code holds all the answers: How did Wicked find the Gladers? Who are group B? And what side are Thomas and Teresa really on? Before there was the Maze, there was the Fever Code.