The third book in Arthur Ransome's wonderful series for children, Peter Duck takes intrepid explorers John, Susan, Titty, and Roger Walker and fearsome Amazon pirates Nancy and Peggy Blackett onto the high seas. Under the command of the infamous Captain Flint (Nancy and Peggy's Uncle Jim), the children brave a real-life pirate and his cutthroat crew, fogy, sharks, and the ravenous crabs of Crab Island in the search of buried treasure.