The Princess Bride is a book very similar to Inkheart in that it contains a device called metafiction. For all of you who aren't yet Literature students, this very simply means that it's a book about a book. In the case of the Princess Bride, it's about a man abridging a story that his father had told him when he was ill in bed, and therefore just giving us the "good bits" of the tale. Other famous examples of metafiction are the Neverending Story, Atonement and the Hitchhiker's Guide to the Galaxy.
Of course, many people know the Princess Bride because of its classic film adaptation rather than the book itself. For those people, here's a reminder of the cheesy but fabulous love song that went with that movie (you'll need Spotify to listen to it).