A mysterious message leads Cody and her friends on a treasure hunt on creepy Alcatraz Island. But they'll need to use all of their code-busting skills if they're going to uncover the hidden secrets - before someone else does. With fun interactive codes to solve throughout, kids won't even realise that while they join the Code Busters on their next adventure they're learning vital problem solving skills and being introduced to key mathematical concepts. Code Busters Club Book 2.

 

This book is part of a book series called The Code Busters Club .

There are 212 pages in this book. This book was published 2013 by Egmont USA .

Penny Warner has written over 30 books, including 5 books in the Connor Westphal mystery series, which features a deaf reporter in California gold country. Her book Dead Body Language was nominated for an Agatha Award and won a Macavity Award for Best First Mystery. Warner is a former Brownie and Girl Scout, as well as a troop leader.