Summer Knight: The Dresden Files #4 -- Jim Butcher

My favorite in the series so far is still Grave Peril, but just barely.  Summer Knight was all about the Faerie folk.  As I've said before, Jim Butcher does 'em right.  They're scary and powerful:

I hate being afraid.  I hate it more than anything in the whole world.  I hate being made to feel helpless.  I hate being bullied, too, and Mab might as well have ramming her fist down my throat and demanding my lunch money.

The Faerie Queens were bad news.  Big bad news.  Short of calling up some old hoary god or squaring off against the White Council itself, I wasn't likely to run into anything else with as much raw power as Mab.  I could have thrown a magical sucker punch at her, could have tried to take her out, but even if we'd been on even footing I doubt I would have ruffled her hair.  And she had a bond on me, a magical conduit.  She could send just about everything right past my defenses, and there wouldn't be anything I could do about it.

Also, Billy the Werewolf from the second book is back, with all of his Teen Wolf friends.  They've become vigilantes.  Yep.  Werewolf vigilantes and the Faerie Queens.  Really.  Who could ask for more? 

Okay, fine.  Here's more:  Due to Harry's actions in the last book, the wizards are at war with the vampires.  This leads to a meeting of the White Council, at which The Merlin proves to be a complete jerk.  Most of that scene's dialogue was in Latin.  I love these books.