It's called The Emperor's Code
It's going to be called "The Emporer's Code" and it's by Gordan Korman. Book 9 is by Margret Peterson Haddix, but I don't know the title yet. Check the 39 Clues Website for more updates.
the emperor's code
The Emperor's Code.
There is not going to be a 12th 39 Clues book, but there is going to be a new 39 Clues series. The first book in the new series is called The Medusa Plot by Gordon Korman.
Into The Gauntlet
It is called the Emperors Code
It is called The Black Circle.
Beyond The Grave.
Vespers Rising.
Storm Warning.
Storm Warning
The 8th book in the series, The Emperor's Code, was released on April 6, 2010.