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The 39 Clues: Cahills vs. Vespers Book 4: Shatterproof (original 2012; edition 2012)
by Roland Smith
References to this work on external resources.
Wikipedia in English
Amazon.com Product Description (ISBN 0545298423, Hardcover)
The fourth book in the CAHILLS VS. VESPERS series, the follow up to the worldwide bestseller THE 39 CLUES.
After pulling some spectacular heists, Amy and Dan have become two of Interpol's most wanted criminals. So when Vesper One orders them to steal the world's largest diamond, they know they're facing life in prison . . . or worse. But with the Cahill hostages still in peril, Amy and Dan have no choice but to launch a mission that leads them to an ancient city full of dangerous secrets. With a Vesper mole sabotaging the Madrigals from inside, Amy and Dan have to fulfill their enemy's request before it's too late. Vesper One has developed a taste for killing Cahills, and Amy and Dan aren't going to wait to see who's next.
(retrieved from Amazon Mon, 30 Sep 2013 13:38:10 -0400)
Amy and Dan Cahill are no strangers to impossible tasks. After seven of their relatives were kidnapped, the siblings scoured Europe for the priceless artifacts Vesper One demanded in exchange for the hostages. But then the Cahill kids are given an assignment that pushes them to their breaking point-a journey to a legendary city. Amy and Dan know they can't afford to fail, yet they're running out of options. . . and running out of time.
(summary from another edition)
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