http://www.amazon.com/Burning-Crowel.../dp/B004F9P980
Lisa Winters has an unseen entity attacking her. First at work and then again in her own home! Deseperate, she tracks down Detective Nick Crowell who handles such things.
The trouble is that he has his own problems, in between trying to solve a string of petty robberies in the neighborhood and breaking in a new partner!
Rated PG 13 for mild sex and violence.