Edge Chronicles 7 : The Last of the Sky Pirates : First Book of Rook
The first book of the Rook Saga, part of the bestselling Edge Chronicles series.
Far out in open sky, a storm is brewing. In its path is Sanctaphrax -- a city built on a floating rock and tethered to the land by a massive chain.
Only Twig -- a young sky pirate captain who has dared to sail over the Edge -- has learned of the approaching danger. But his perilous voyage destroys his sky ship, hurling his crew into and beyond the Deepwoods, and robbing Twig of his memories.