You guys!! There's a book about mystery books that take place in the book world!! This is probably the most perfect thing ever for the Hey-There's-A-Dead-Guy librarian Sunday post.
It's a limited edition, pricy book (200 copies, $75), but if ever there was an audience for such a book, it's us, right? The best part, to me: it contains 130 full-color photographs of "rare or especially interesting dust jackets and covers."
The Oak Knoll page says the publication year is 2013, but this page says the publication date is July 2014. I think it probably just came out, because it isn't in any libraries yet.