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When Professor Sherman is found afloat at sea, the entire country is on pins and needles waiting to hear his tale — and his is a tale that does not disappoint. Sherman's solo trip across the Pacific Ocean in a hot air balloon is cut short when he lands unexpectedly on the island of Krakatoa shortly before its eruption. The Twenty-One Balloons is a fantastic tale of adventure with balloons, marvelous inventions, diamonds, and a volcano.