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Publisher's Summary

The thrilling conclusion to 39 Clues, Part VI: Doublecross.

A Cahill family member from the past is bent on revenge! Confidential until July 2016!

©2016 Sarwat Chadda (P)2016 Scholastic Inc.

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Best books ever!!!

The narrator was amazing. It keeps you guessing at every turn and makes you feel as though you are watching everything actually happens. I would most definitely recommend it out family has rnjoyed it. And we have read it since the begining of the books!