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U = Unbreakable Code, by Jennifer Chambliss Bertman (book review) – hot book hunt or literary fire bug?
Coded messages in books, ships beneath buildings, an arsonist who must be stopped! Emily and James are always on the hunt for books hidden by fellow Book Scavenger fans, but when coded clues in particular volumes link up with revenge-fueled fires at listed hidden-book sites, they decide to solve the mystery… but the fire bug is watching them! Happy book birthday to The Unbreakable Code! You can read this second adventure in the series by itself, but will enjoy it even more if you get the full background in book one, Book Scavenger (my no-spoiler recommendation here). Be sure to visit the Book Scavenger game website if you want to …