Never turn your back on the Cahills . . . The most powerful family history has ever known returns with a vengeance in The 39 Clues: Doublecross! The Cahills are the world's most powerful family, but their strength is being tested. A sinister man calling himself The Outcast has targeted the family and set them an impossible test. He's recreating four of history's worst disasters and challenging the young Cahills to find and stop the tragedies before it's too late. Now, with one disaster behind them, siblings Dan and Amy Cahill and their friends have just days to discover what the Outcast's next move will be. Their frantic search seems to be pointing toward a terrifying air disaster, the explosion of the Hindenburg airship. But no one travels by airship anymore -- what do the Outcast's cryptic messages mean? The young Cahills must split up and take to the skies to try to find the answer . . . before their whole world comes crashing down.

 

This is book 4 in 39 Clues .

There are 224 pages in this book. This book was published 2016 by Scholastic .

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.