Your question can't be answered unless you tell us 'the fourth book of what?"
The fourth book is titled the Battle of the Labyrinth.
yes, there will be a fourth book.
The fourth book is called The Divide.
The fourth Alphas book is The Top of the Feud Chain.
Fourth Way - book - was created in 1957.
The Fourth Book of Jorkens was created in 1947.
when the fourth book inheritance air in bulgaria
alot of points in the fourth twilight book
The fourth book is called the Sign of the Moon.
Fourth Way - book - has 480 pages.
The Fourth Book of Jorkens has 176 pages.
Erin Hunter hasn't written the fourth book or released the name of the fourth book yet.