The Barney for best mix of a mythological creature and a library goes to
One of the best YA books I have ever read, and it should be enjoyable for any adult lover of fantasy. A clever take on the trip through fairyland, this is a YA book that made me break out the dictionary at one point.
At one time Valente could be considered underrated, but I doubt there are many who are not aware of her wonderful works at this point, the sequel even got a short article in Time Magazine. Hopefully I will read and review the sequel very soon.