Prince Walter can't earn his knighthood without proving himself on a quest. Unfortunately for him, all seems peaceful in the kingdom of Arualia ever since the White Cougar was defeated. Aaron can't decide whether he really wants to be a knight at all. Is there something else he wants more? But when a mysterious librarian with an alarming revelation about Aaron's sword points Walter, his sisters...
Three children must go on a quest to find a cure to save their father by climbing over the edge of the world, using as their guides a prophecy given by an ill-reputed pseudo-historian and a map of unknown origins. Along the way, they will meet creatures of myths and legends, as well as Aaron, a peasant boy also searching for the cure. The four children learn of long forgotten secrets and...