Into the Gauntlet

I liked this book written by Margaret Peterson Haddix. After crossing five continents and solving some of history's most perplexing mysteries, Amy and Dan Cahill are nearing the end of their adventure. As the final clue promises to reveal the truth about the Cahill family's awesome power, Amy and Dan must successfully complete a challenge that their ancestors have failed to do for nearly 500 years.

This is the tenth and final book in The 39 Clues novel series. The globe symbol on the cover is, unlike the first nine books, shattered into pieces. The 39 Clues: The Movie is scheduled to be released in late 2011.