"Urban Fantasy" stories about werewolves (and other supernatural beings) are a dime a dozen. Shiver's unusual mechanics, where after an initial acclimatization period, temperature the controlling mechanism for whether the were is in wolf or human form definitely was intriguing. While at first I was impatient with the constant angst over the developing relationship between Grace and Sam and the pre-occupation with Sam's impending doom, by the end of the story I found myself tearing up at crucial moments.
Shiver made an excellent Audiobook.
While I only found Maggie Stiefvater this year with the release of The Raven Boys, I will definitely be taking the time to read the rest of her back catalog.