Monday with a Mad Genius



History, mystery, and magic!

Jack and Annie are on a mission to save Merlin from his sorrows! Charged with finding the second of four secrets of happiness, the brother-and-sister team travels back in the magic tree house to the period known as the Renaissance. This time, Jack and Annie will need more than a research book and a magic wand. They'll need help from one of the greatest minds of all time. What secrets will they learn from Leonardo da Vinci?
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