Monsters stalk the world Above, colossal beasts hunting through the forests of Haven for their next meal. Pil Persins would very much like to see one. To study them up close. Even if they truly are the reason his mother is gone.

Joining the Exidite-expeditioners who study and harvest the wonders of the world Above-is a way out of his poverty-stricken, underground world.

When Pil is finally given the chance to take the Exidite trials, the monsters become all too real. Pil and his friends soon find out that there's something else prowling the great forests of Haven.

Something more terrifying than any beast. Something with a plan.