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Storm Warning (The 39 Clues, Book 9) (edition 2010)
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"Amy and Dan hit the high seas as they follow the trail of some infamous ancestors to track down a long lost treasure. However, the real prize isn't hidden in a chest. It's the discovery of the Madrigals' most dangerous secret and, even more shockingly, the true identity of the mysterious man in black."--Amazon.com.
(summary from another edition)
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