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Publisher's Summary

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!
©2015 C. Alexander London (P)2015 Scholastic Inc.
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Customer Reviews

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5 out of 5 stars
By Amazon Customer on 05-03-16

Totally twisted

It was good because all the main characters were spared. The end was totally unlike all the other books. We liked it because it was about space.

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1 of 1 people found this review helpful

5 out of 5 stars
By Benjamin R. Luman on 07-23-17

Awesome adventure

Love these stories! Give me crazy travel fever! Love all of the information I learned about places I have been to and never knew previously . The series was difficult to determine whether or not it came after The previous double Cross series. Presumably it's the last four books out of all 39 clues. What a ride! Have turned many others on to what a great adventure this is! Well written and incredible narration!

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