Small Favor by Jim Butcher The Dresden Files # 10 (423 pgs) 2008
Dresden owes the Queen of Fairy a favor, and she’s calling in her marker. The deed appears simple enough- return a kidnapped man safely. But little in Harry’s world is ever as easy as it seems.
Cue the murderous hobgoblins, evil fallen angels, and increasingly deadly creatures who inspired the “billy goats gruff” fable. And they’re all out to get Harry.