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Never turn your back on the Cahills.... The most powerful family history has ever known returns with a vengeance in The 39 Clues: Doublecross! Confidential until August 2015! Read more REVIEW The 39 Clues remains...-A NEW YORK TIMES Bestselling Childrens Book Series-A USA TODAY Bestseller-A WALL STREET JOURNAL Bestseller-A PUBLISHERS WEEKLY Bestseller-An INDIE BOUND Bestseller ABOUT THE AUTHOR C. Alexander London is an author of books for children and adults. In addition to the Dog Tags and Tides of War series, he writes the Accidental Adventures novels for young readers and books like One Day the Soldiers Came: Voices of Children in War for older readers. When he is not writing books, he can usually be found walking around New York City talking to his dog. Read more