<P> The series has sold over 130 million copies worldwide, becoming one of the best - selling book series ever written . </P> <P> In the series, the title character is a talking 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 . </P> <P> He has a younger sister named Thea Stilton, a cousin named Trap Stilton, and a favorite little nephew, nine - year - old Benjamin Stilton . Geronimo is a nervous, mild - mannered mouse who would like nothing better than to live a quiet life, but he keeps getting involved in far - away adventures with Thea, Trap, and Benjamin, and sometimes Aunt Sweetfur . The books are written as though they are autobiographical adventure stories . </P> <P> The work of an Italian author under a pseudonym, the series has become the most popular children's book series in Italy and the books have been translated into 35 languages . </P>

The main character of book one of paradise lost is