I just finished reading a great book: Inkspell by Cornelia Funke. It is the sequel to Inkheart.

In Inkheart, Meggie discovers that her father,Mo, can literally read characters out of books. Unfortunately, he has accidentally read some real villains out of the book Inkheart. When the villains kidnap Mo, Meggie must try to find and rescue him.

In Inkspell, Meggie and her family are read into the book Inkheart, and find that while adventures in books are exciting, in real life they can be very dangerous.

I'd recommend both books highly, but make sure you start with Inkheart. And here's a warning -- there are obviously plans for another sequel, because everything is not wrapped up at the end of Inkspell!