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The Unbreakable Code - Chambliss Bertman, Jennifer
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Mr. Quisling is definitely up to something mysterious, and Emily and James are on high alert. First, there's the coded note he drops at a book event. Then Emily and James uncover a trail of encrypted messages in books by Mark Twain hidden through Book Scavenger. What is most suspicious is that each hidden book triggers an arson.

The Unbreakable Code 2018, Square Fish, New York

ISBN-13: 9781250158390

Trade paperback

The Unbreakable Code 2017, Henry Holt & Company, New York

ISBN-13: 9781627791168