| ISBN: | 9780545767460 |
| Publisher: | Scholastic Inc. |
| Published: | 28 July, 2015 |
| Format: | Hardcover |
| Language: | English |
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!
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