On the floating island of Lithos, war never ends as its three nations clash for dominance. But a new danger threatens them all — the island’s crystal, the very source that keeps Lithos afloat, is losing power. If it fails, the island will plummet to the ground below. In a desperate bid for survival, each kingdom sends its elite Dragon Rider on a perilous mission to descend to the surface and search for the legendary paradise known as Arcadia — a place said to be free of war. Can they find Arcadia before Lithos falls from the sky?