Bartimaeus Trilogy, Book Three Ptolemy's Gate

Now available in paperback--the thrilling conclusion of the Bartimaeus trilogy. Here, the secrets of Bartimaeus's past are revealed, and Bartimaeus, Nathaniel, and Kitty must face treacherous magicians, unravel a masterfully complex conspiracy, and defeat a formidable faction of demons.
'Ptolemy's Gate' is the climax of the 'Bartimaeus Trilogy' in which a long-standing conspiracy comes to fruition and Bartimaeus, Nathaniel and Kitty face a final enemy which threatens them all.