Geronimo Stilton is an Italian children's book series. Although the series credits its title character as the author, the true author is Elisabetta Dami. The books are intended for readers in the 6—year-old age range. The series has sold over million copies worldwide, and with editions it is one of the best-selling book series ever written. In the series, the title character is an anthropomorphic mouse who lives in New Mouse City on Mouse Island. A best-selling author, Geronimo Stilton  works as a journalist and editor for the fictional newspaper The Rodent's Gazette. He has a younger sister that has been named Thea Stilton,  a cousin named Trap Stilton,  and a favourite nephew, nine-year-old Benjamin Stilton Ben.