Yes there will be one. The release date is not known but spoiler(scroll down to know)
It is about Gabriel.
There is no fourth book only Three in the trilogy.
In the fourth book
There is no 4th book. It is only a trilogy.
There is no fourth book. The series is a trilogy, which means only three books.
It's quite simple there is no fourth book (its just a trilogy)
There will not be a fourth book in the series because the series is a trilogy.
Yes. It is Book Zero, and can be read as the first book, or the fourth book.
The novel forms a loose trilogy with two other books set in the same future era: Gathering Blue (2000) and Messenger(2004). A fourth book titled Sonis in preparation in 2012.
no, inkdeath was the conclusion to the trilogy.
Do you mean Eragon? If yes then it has already come out and there is a fourth book.
There was not a fourth book it was only a trilogy. Although there have been many other woks concerning Middle Earth such as The Hobbit and the Silmarillion.
there is a fourth book out there for the series but it's a prequel of bartimaeus in Jerusalem during the time of king Solomon. The Story is over for Bartimaeus in England