The Cahills are the most powerful family in human history. The source of their power has been hidden around the world in the form of 39 Clues. The hunt for the clues is on - and these cards are your best chance to find them.

 

This book is part of a book series called 39 Clues .

There are 224 pages in this book. This book was published 2008 by Scholastic US .

The Unknown Adventurer is still believed to be at large in the wild.