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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. Review Praise for The 39 Clues Featured on NBC's Today Show, Good Morning America, USA Today, The New York Times , NPR's Morning Edition, Associated Press "One blazing success." The Huffington Post "An interactive mystery...it's more than just a reading adventure." Boys' Life "This is a multi-media adventure where you also search for cluesin books, trading cards and online. Get searching!" Girls' Life About the Author Roland Smith first worked with animals at the Portland Zoo, and he has been involved in animal rescues and conservation work around the world for more than twenty years. He is the author of Jack's Run, Zach's Lie, Cryptid Hunters, Peak, and most recently Tentacles, his Scholastic debut. He is also the co-author of numerous picture books with his wife, Marie. Roland lives with Marie on a farm south of Portland, Oregon, and he enjoys writing, traveling, and visiting schools. You can find him online at www.rolandsmith.com. ϡ쯦랠