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The Unbreakable Code


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.

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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


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