The Law: A Dresden Files Novella: Dresden Files, Book 17.5

Not every danger comes in the form of a mega-threat like a Titan. Some predators are a lot cozier...more personal. 
When one such creature threatens an independent tutor, Harry Dresden must shake off the blood and dirt of his most recent battles and rise to the occasion, even when it turns out that the new predator is far more dangerous and connected than first appearances would suggest.