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 travel 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 will they learn from Leonardo da Vinci?
"I'm one of those very lucky people who absolutely loves what they do for a living. There is no career better suited to my eccentricities, strengths, and passions than that of a children's book author."--Mary Pope Osborne
Mary Pope Osborne is the author of the popular Magic Tree House series. She works with her husband Will and her sister Natalie on the nonfiction companion series, Magic Tree House Research Guides. Many of her books have been named to best-books lists.





