Something Rotten by Jasper Fforde
Thursday Next has been the Bellman for a couple of years now, but she's ready to go back to the real world. Along with Hamlet (who's concerned about the outside world's perception of him as a ditherer), Thursday returns determined to get her husband Landen uneradicated and to send Yorrick Kaine back to the Bookworld where he belongs.
For months, my mom has been begging me to read this book, the fourth in a series that I first recommended to her. So she was pleased when I finally got to it, laughed at loud on several occasions, and promptly finished it only to revisit some favorite parts with her. I recommend reading Hamlet first, as it will make the bookish humor that much more enjoyable. 4.5 stars.
Cross-posted at Born Reader.