Silver Borne
Patricia Briggs
Werewolves and the Faerie Queen
Book 5 in Patricia Briggs's Mrercyc Thompson urban fantasy series, is ostensibly about a run-in with the fae. But it has at least as much to do with the workings of werewolf packs.
Mercy is the mate of Adam Hauptmann, the alpha of the Columbia Basin werewolf pack. That means that, despite not herself being a werewolf, Mercy is a member of a werewolf pack. The pack is linked by the werewolf bond, a kind of magical communication and power link, and Mercy is now part of that. Not everyone in the pack is overjoyed with this, or with Mercy herself. The pack has been discombobulated for some time because Adam claimed Mercy as his mate years ago and Mercy did not at first reciprocate. (She was in fact understandably angry about being claimed without consent.) At the same time, her former lover Samuel Cornick, a very, very old werewolf, is fading away, and is in fact in grave danger.
That's all background. The story begins when Mercy gets a call from an old fae friend. She had (in Iron Kissed) borrowed a book from a part-fae bookseller, Phineas Brewster, which she never got around to returning. Phin has vanished and Mercy's old friend wants to know what happened to the borrowed book.
Well, it turns out that someone wants that book. Someone wants it a whole lot. They want it enough to mess with a pack of werewolves to get it. It doesn't help that the pack in question is not running on all cylinders, and that Mercy still doesn't quite know how to operate this thing -- "this thing" being her bond with the Adam and the pack.
So, that's the set-up. It's a werewolves vs fae throw-down. Of course, since this is the fifth novel in a 14-novel series, you know that Mercy is going to get out of it alive, somehow. When the book ends, we know a lot more about how the werewolf pack bond and Mercy's bond with Adam works than we did going in.