1. The 13-Story Treehouse: Monkey Mayhem! (The Treehouse Books, 1)

2. The 26-Story Treehouse: Pirate Problems! (The Treehouse Books, 2)

3. The 39-Story Treehouse: Mean Machines & Mad Professors! (The Treehouse Books, 3)

4. The 52-Story Treehouse: Vegetable Villains! (The Treehouse Books, 4)

5. The 65-Story Treehouse: Time Travel Trouble! (The Treehouse Books, 5)

6. The 78-Story Treehouse: Moo-vie Madness! (The Treehouse Books, 6)

7. The 91-Story Treehouse: Babysitting Blunders! (The Treehouse Books, 7)

8. The 104-Story Treehouse: Dental Dramas & Jokes Galore! (The Treehouse Books, 8)

9. The 117-Story Treehouse: Dots, Plots & Daring Escapes! (The Treehouse Books, 9)

10. 130-Story Treehouse (The Treehouse Books, 10)

11. 143-Story Treehouse (The Treehouse Books, 11)

12. The 156-Story Treehouse: Holiday Havoc! (The Treehouse Books, 12)