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The Mysterious Love Letter
9. The Mysterious Love Letter
- Series
- 1. Thea Stilton And The Dragon's Code
- 2. Thea Stilton and the Mountain of Fire
- 3. Thea Stilton and the Ghost of the Shipwreck
- 4. Thea Stilton and The Secret City
- 5. Thea Stilon and the Mystery in Paris
- 6. Thea Stilton and the Cherry Blossom Adventure
- 7. Thea Stilton and the Star Castaways
- 8. Big Trouble in the Big Apple
- 9. Thea Stilton and the Ice Treasure
- 10. Thea Stilton and the Secret of the Old Castle
- 11. Thea Stilton and the Blue Scarab Hunt
- 12. Thea Stilton and the Prince's Emerald
- 13. Thea Stilton And The Mystery On The Orient
- 14. Thea Stilton and the Dancing Shadows
- 15. Thea Stilton and the Legend of the Fire Flowers
- 16. Thea Stilton and the Spanish Dance Mission
- 17. Thea Stilton and the Journey to the Lion's den
- 18. Thea Stilton and the Great Tulip Heist
- 19. Thea Stilton and the Chocolate Sabotage
- 20. Thea Stilton and the Missing Myth
- 21. Thea Stilton and the Lost Letters
- 22. Thea and the Tropical Treasure
- 23. Thea Stilton and the Hollywood Hoax
- 24. Thea Stilton And The Madagascar Madness
- 25. Thea Stilton and the Frozen Fiasco
- Special Editions
- 1. Journey to Atlantis
- 2. The Secret of the Fairies
- 3. The Secret of the Snow
- 4. The Cloud Castle
- 5. The Treasure Of The Sea
- Boxed Sets
- Graphic Novels
- 1. The Secret of Whale Island
- 2. Revenge of the Lizard Club
- 3. The Treasure of the Viking Ship
- 4. Catching the Giant Wave
- 5. The Secret of the Waterfall in the Woods
- 6. The Thea Sisters And The Mystery At Sea
- 7. A Song for the Thea Sisters
- Mouseford Academy
- 1. Drama at Mouseford
- 2. The Missing Diary
- 3. Mouselets in Danger
- 4. Dance Challenge
- 5. The Secret Invention
- 6. A Mouseford Musical
- 7. Mice Take The Stage
- 8. A Fashionable Mystery
- 9. The Mysterious Love Letter
- 10. A Dream on Ice
- 11. LIghts, Camera, Action!
- 12. Mice on the Runway
- 13. Sea Turtle Rescue