Reading order
| # | Title | Published | Author | Buy on Amazon |
|---|---|---|---|---|
| 1 | Thea Stilton and the Dragon’s Code | 2009 | Geronimo Stilton | Buy |
| 2 | Mice to the Rescue | 2012 | Geronimo Stilton | N/A |
| 3 | Thea Stilton and the Mountain of Fire | 2009 | Geronimo Stilton | Buy |
| 4 | Robot Attack | 2014 | Geronimo Stilton | N/A |
| 5 | Thea Stilton and the Ghost of the Shipwreck | 2010 | Geronimo Stilton | Buy |
| 6 | Flood Mission | 2015 | Geronimo Stilton | N/A |
| 7 | Thea Stilton and the Secret City | 2010 | Geronimo Stilton | Buy |
| 8 | The Perilous Plants | 2015 | Geronimo Stilton | N/A |
| 9 | Thea Stilton And The Mystery In Paris | 2010 | Geronimo Stilton | Buy |
| 10 | The Invisible Thief | 2015 | Geronimo Stilton | N/A |
| 11 | Thea Stilton and the Cherry Blossom Adventure | 2011 | Geronimo Stilton | Buy |
| 12 | Thea Stilton and the Star Castaways | 2011 | Geronimo Stilton | Buy |
| 13 | Big Trouble in the Big Apple | 2011 | Geronimo Stilton | Buy |
| 14 | Thea Stilton and the Ice Treasure | 2011 | Geronimo Stilton | Buy |
| 15 | Thea Stilton and the Secret of the Old Castle | 2012 | Geronimo Stilton | Buy |
| 16 | Thea Stilton and the Blue Scarab Hunt | 2012 | Geronimo Stilton | Buy |
| 17 | Thea Stilton and the Prince’s Emerald | 2012 | Geronimo Stilton | Buy |
| 18 | Thea Stilton and the Mystery on the Orient Express | 2012 | Geronimo Stilton | Buy |
| 19 | Thea Stilton and the Dancing Shadows | 2013 | Geronimo Stilton | Buy |
| 20 | Thea Stilton and the Legend of the Fire Flowers | 2013 | Geronimo Stilton | Buy |
| 21 | Thea Stilton and the Spanish Dance Mission | 2013 | Geronimo Stilton | Buy |
| 22 | Thea Stilton and the Journey to the Lion’s Den | 2013 | Geronimo Stilton | Buy |
| 23 | Thea Stilton and the Great Tulip Heist | 2014 | Geronimo Stilton | Buy |
| 24 | Thea Stilton and the Chocolate Sabotage | 2014 | Geronimo Stilton | Buy |
| 25 | Thea Stilton and the Missing Myth | 2014 | Geronimo Stilton | Buy |
| 26 | Thea Stilton and the Lost Letters | 2015 | Geronimo Stilton | Buy |
| 27 | Thea Stilton and the Tropical Treasure | 2015 | Geronimo Stilton | Buy |
| 28 | Thea Stilton and the Hollywood Hoax | 2016 | Geronimo Stilton | Buy |
| 29 | Thea Stilton and the Madagascar Madness | 2016 | Geronimo Stilton | Buy |
| 30 | Thea Stilton and the Frozen Fiasco | 2017 | Geronimo Stilton | Buy |
| 31 | Thea Stilton and the Venice Masquerade | 2017 | Geronimo Stilton | Buy |
| 32 | Thea Stilton and the Niagara Splash | 2018 | Geronimo Stilton | Buy |
| 33 | Thea Stilton and the Riddle of the Ruins | 2018 | Geronimo Stilton | Buy |
| 34 | The Phantom of the Orchestra | 2019 | Geronimo Stilton | Buy |
| 35 | Black Forest Burglary | 2019 | Geronimo Stilton | Buy |
| 36 | Race for the Gold | 2020 | Geronimo Stilton | Buy |
| 37 | The Rainforest Rescue | 2020 | Geronimo Stilton | Buy |
| 38 | The American Dream | 2021 | Geronimo Stilton | Buy |
| 39 | A Roman Holiday | 2021 | Geronimo Stilton | Buy |
| 40 | Fiesta in Mexico | 2022 | Geronimo Stilton | Buy |
| 41 | Cave of Stars | 2023 | Geronimo Stilton | Buy |
| 42 | The Ghost of The Woods | 2024 | Geronimo Stilton | Buy |
The Thea Stilton series is a long-running spin-off from the main Geronimo Stilton franchise, starring five mouse friends who attend Mouseford Academy on Whale Island. Named in honor of Geronimo’s sister Thea, the Thea Sisters travel the globe solving mysteries and helping people in trouble. Each book is set in a different location, from Paris and Venice to Madagascar and the Amazon rainforest, giving young readers a taste of world geography along with the adventure.
With 42 books published between 2009 and 2024, this is one of the most prolific branches of the Geronimo Stilton universe. The series has its own identity separate from the main books, focusing on friendship, teamwork, and problem-solving rather than Geronimo’s bumbling humor. Titles like Thea Stilton and the Dragon’s Code, Thea Stilton and the Chocolate Sabotage, and The Phantom of the Orchestra give a sense of the range. The series is popular with readers who enjoy the Geronimo Stilton world but want a different set of protagonists.