New York: Scholastic, (2013) dj. SIGNED hardcover first edition - An alternate history adventure by this Edgar-winning author: "In 1753, noted American naturalist John Bartram and his son Billy join an expedition to search the frontier in the di Terzi, a flying ship powered by Òvacuum balloonsÓ and wind. Their mission is to find the centuries-old Kingdom of Madoc, a Welsh settlement rumored to be on the frontier. Along the way they encounter the young George Washington, hostile French troops, a herd of enormous incognitum (mastodons), and a terrifying bear-wolf." SIGNED on the title page. Author's note. 348 pp. ISBN: 9780545274265.