It's already out. It's called 'Vespers Rising'.
its out right now!
aug 31st.
June 2, 2009
11th August
February 2nd, 2010.
Same as Book 10.
Tomorow or May 24 2010
A King's Ransom, by Jude Waston
1.the cahills arent the only ones looking for the clues. 2.the vespers are coming
the cahills arent the only ones looking for the clues and the vespers are coming
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! As far as I know, there is going to be an eleventh book of The 39 Clues: The Black Book Of Buried Secrets It will answer all your questions. LUCIANS RULES!
The name of the 10th 39 clues book is Into The Gauntlet.