Monday with a Mad Genius (Magic Tree House No. 38)

by Mary Pope Osborne, Sal Murdocca (Illustrator)

http://amazon.com/dp/0375837302

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?