The Quest for The 39 Clues Comes to a Close with Into the Gauntlet

The quest comes to an end for Amy and Dan Cahill with Into the Gauntlet by Margaret Peterson Haddix, the 10th and final book in the bestselling The 39 Clues series of thrillers for kids.

Throughout their hunt, the brother and sister have uncovered history's greatest mysteries and their family's deadliest secrets. But are they ready to face the truth about the Cahills and the key to their unmatched power?

After a whirlwind race that's taken them across five continents, Amy and Dan face the most the difficult challenge yet -- a task no Cahill dared to imagine. When faced with a choice that could change the future of the world, can two kids succeed where 500 years worth of famous ancestors failed?

We've been fans of this series. Between our own Mysterious Reviews, student reviews submitted to First Clues, and featured reviews on Book Trends, we've posted links to reviews for each of the first nine books in the series on the First Clues: The 39 Clues book page. We'll have a review of this tenth and final book soon!