How many 39 clue books are there?

So far there are ten books. Since the 39 clues series is a best seller, they might make more.

My Agent Code Is: P39FFM3PXP

And One Last Thing, Lucians Rule!

Up until now, there are 10 books: the maze of bones, one false note, the sWord thief, beyond the grave, the black circle, in too deep, the viper's nest, the emperor's code, storm warning, and into the gauntlet. The last book of the 39 clues will be book 11: Vespers Rising, which will be released in April 4 2011 and written by Gordon Korman, Peter Lerangis, Rick Riordan, and Jude Watson. Now, there is going to be a SECOND series called "Cahills vs. Vespers" which will consist of 6 books. the first book of the Cahills vs. vespers will be released in August 2011, and will be written by Gordon Korman. Book two will be written by Jude Watson and released in December 2011. Peter Lerangis will write book three that will be released in March 2012, and Ronald Smith will write book four which will be released in August 2012. Book five will be written by Linda Sue Park and will be released in December 2012. The final book will be written by David Baldacci and will be released in March 2013. The 39 Clues: The Movie is scheduled to be released in 2014.

PS. Oh and....Lucians? No thanks, Madrigals Rule! :P