The Magic Tree House Wiki

Monday with a Mad Genius is the thirty-eighth installment to the Magic Tree House series and the tenth of the Merlin Missions.


Jack and Annie travel 500 years back in time to Florence, Italy, and spend a day helping Leonardo da Vinci in the hope of learning another secret of happiness.


  1. Old Friends
  2. Looking for Leonardo
  3. Ten Types of Noses
  4. Battle Scene
  5. Knock, Knock
  6. Thousands of Ideas
  7. The Great Bird
  8. Wings!
  9. The Smile
  10. Questions

Notes on time and place settings