There are 34 books in Thea Stilton Series and there are 2 ancillary books in related to this series .
Thea Stilton is the younger sister of Geronimo Stilton . Numbering reflects English translations. Numbering in other languages varies.
Other series related to Thea Stilton Series are Thea Stilton: Special Edition , Principesse del Regno della Fantasia , Mouseford Academy and Thea Stilton Graphic Novels .