Jim Butcher's The Dresden Files: Ghoul Goblin

A small, isolated Midwestern town is being terrorized by a pair of the Nevernever's most vile creatures, who've managed to decimate the star-crossed Talbot family. Harry's sworn to protect the survivors and end the curse-something that can only be accomplished if he can convince them to take refuge in what amounts to a supernatural fortress. And if the ancient guardian spirit he's summoned doesn't kill him first...and if the local cops don't toss him into a jail cell...