Jost is an unusual loner in Cartha. He wanders the stone maze that surrounds his city, where hideous creatures dwell and danger lurks. No one else dares set foot within the maze.
On a day like any other, he discovers a gem in the walls, which he takes for himself. But the gem contains an ancient magic which protects Cartha, and when Jost returns to the city, he finds it under attack by monsters.
Now, Jost must go deeper into the labyrinth than he ever has before, and unearth the secrets of the magic in this world. If he doesn't learn to understand it, it will consume the other cities and all of humanity.