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Peter Duck (original 1932; edition 1993)
Peter Duck by Arthur Ransome (1932)
References to this work on external resources.
Wikipedia in English
Amazon.com Product Description (ISBN 0879236604, Paperback)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.
(retrieved from Amazon Mon, 30 Sep 2013 13:26:02 -0400)
Six intrepid brothers and sisters crew out on the high seas where they brave every imaginable danger.
(summary from another edition)