Stormchaser (The Edge Chronicles, No. 2)

Since his childhood in the DeepWoods, young Twig has always longed to soar above the forest canopy and explore the sky. Now a crew member on his fathers sky pirate ship, the Stormchaser, his dream seems fulfilled. But a much higher destiny awaits Twig. The lofty city of Sanctaphraxbuilt on a giant rock, floating high in the skyis at the point of disaster. The citys future is dependent on stormphraxa valuable substance available only from the heart of a Great Storm. And only the Stormchaser, with Twig onboard, could risk entering a storm. . . .