Inkdeath by Cornelia Funke

The final book of the Inkheart trilogy, finds Meggie and her family still in Ink World. Mo is being hunted by the Adderhead, who wants Mo to rebind the book that has given him immortality. The Adderhead is furious over the trick that Mo and Meggie played in Inkspell and is wreaking havoc in Ink World. Fenoglio has lost his control over the story. Mo, as the Bluejay, and the Black Prince try to fend off attacks by the Piper and others sent by Adderhead to capture Mo, Meggie and Resa. Meanwhile, Elinor is stuck in our world wondering what is happening to her loved ones. This is an exciting end to Funke's extraordinary fantasy.