On the eve of his 15th birthday, Corvan discovers a small stone hammer buried beneath his backyard fort. The hammer opens hidden doors and reveals family secrets. When his best friend Kate is taken prisoner, Corvan will leave his small town to rescue her, but first he must make an uneasy alliance with the guardian of the labyrinth. His subterranean journey into the world of the Cor will challenge his childhood dream of becoming a super hero and force him to confront the realities of what it takes to be a leader.