I'd have to say the 10th one: Into The Gauntlet
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The Ekaterinas
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You have to read this book, it is the best book in the world! its about these kids who are searching for 39 clues!
It means that 29 of the 39 clues are currently available.
They only have 39 clues.
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Online, the second clue in the 39 clues is hydrogen. But in the second book of the 39 clues is tungsten
There is no misssion 12 in the 39 clues.
There's only 39 clues!!
39 clues
no cheating in the 39 clues!