In almost every single The 39 Clues book, there are puzzles hidden inside the book, such as on the page numbers, or on the covers. i.e, in The Viper's Nest (series 1, book 7), starting on page 39 there is Morse Code hidden on the page. And on the front cover, there is the string MDIALAE=RC, and on the back cover this is ARGLEDRGAE, which when stacked it says



Who designs these puzzles?

Little bit of random stuff:

You can solve these puzzles and type the answer in on the The 39 Clues site.


  • In-universe or out-of-universe? – Shokhet Feb 12 '17 at 2:34
  • @Shokhet - out of universe, they aren't in universe. – Mithical Feb 12 '17 at 5:07
  • What are you asking for? Someone at Scholastic probably puts the puzzles together. Do you want a name? (I doubt the authors do it, but they might) – Shokhet Feb 14 '17 at 2:59
  • @Shokhet - yes, names. – Mithical Feb 14 '17 at 5:29
  • @Shokhet - exactly, your last sentence there. Does a team at Scholastic do it? Does the author? Does the author find someone? Etc. – Mithical Apr 9 '17 at 12:09

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