In this amazing adventure, Thea's friends the Thea Sisters head to Peru, where a good friend of Paulina's is in danger. There, the five mice climb the Andes mountains in search of a mysterious treasure that's hidden in the Secret City of the Incas. Readers will love following the clues to help the Thea Sisters solve the mystery!

This book is part of a book series called Geronimo Stilton-Thea Stilton .

This book has been graded for interest at 7-10 years.

There are 161 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 Scholastic US .

Thea Stilton is a special correspondent for The Rodent's Gazette, Mouse Island's most famouse newspaper. A graduate of Mouseford Academy, Ms. Stilton loves traveling and adventures. Find out more at www. scholastic. com/geronimostilton.