The 39 Clues, Cahill vs. Vespers, Rapid Fire, The Cahill Files, and the upcoming Unstoppable series, are written by some of the most famous and talented authors and authoress' today. From Rick Riordan, to Roland Smith, to Margaret Peterson Haddix. There is not a bad book in the series, and all the authors, in some way or another, inspire their readers in some way or another.  We are greatly indebted to the wonderful people, who take us to faraway lands, or let us be powerful, when we don't feel like it. Thank you, to all The 39 Clues authors <3

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