6 books in series

Geronimo Stilton: Heromice

Geronimo Stilton: Heromice is a 6-book series with 6 released primary works first released in 2009 with contributions by Geronimo Stilton.

Mice to the Rescue
Robot Attack
Flood Mission
The Perilous Plants
The Invisible Thief
I Difensori Di Muskusrat City