There already is. Well there are two more but not about the hunt it is all the same characters mostly though. One of the new books is The Black Book of Buried Secrets and one is Vesper's Rising. I have read all the book except Vesper's Rising and I am now finishing the black book of buried secrets. Hope this helps.
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In April 2011
Vespers Rising.
October 26 2010
There are currently no plans for Book 11 in "The 39 Clues" series. The original series concluded with Book 10, and subsequent spin-off series have been released since.
The answer to the Book 11 puzzle in The 39 Clues series is "Kobold".
The name of the 10th 39 clues book is Into The Gauntlet.
there is no 49 clues book it is 39 clues
The title of the seventh 39 clues book is The Viper's Nest. My agent Code is P2J34GKXXP on the 39 clues website.
the name of the 5th 39 clues book is the black circle
there is no page clue in 39 clues book 9