This is volume 40 in Geronimo Stilton .

This book has been graded for interest at 7-9 years.

There are 100 pages in this book. This is a chapter book. Publishers market early chapter books at readers aged 6-10 years. This book was published 2010 by Turtleback Books .

In his spare time, Mr. Stilton collects antique cheese rinds. But what he most enjoys is writing books where he tells his fabmouse adventures!