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After reading 1405 websites, we found 2 different results for "Who wrote One False Note (The 39 Clues, Book 2)"
Gordon Korman
Unlike the first book which was written by Rick Riordan, One False Note was written by Gordon Korman, best known for Gordon Korman's many young-adult series’, including On the Run, Everest and Kidnapped.
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by Gordan Korman
One False Note is an exciting adventure novel written by Gordan Korman.
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