Dead Beat (The Dresden Files, Book 7) by Jim Butcher

I found this book rather hard going but i got through it, not one of my favourite authors or series, which is a surprise as i enjoy fantasy and crime, it seemed an ideal combination for me but I just didn't get on with it.

This adventure finds Chicago's preeminent wizard coping with his new roommate--vampire half-brother Thomas. Harry soon has problems bigger than Thomas' clutter to deal with. Marva, one of Harry's vampire foes, summons him with a threat to his police-lieutenant friend, Karrin Murphy. Marva demands Harry get the Word of Kemmler for her, or she'll frame Murphy for murder. Harry doesn't even know what the Word is, but while he's trying to find out, and also what damage Marva will be able to do with it, several necromancers descend on Chicago. When Harry learns that the newcomers are students of Kemmler, an evil wizard who mastered ancient spirits in a way no one has since, he discovers that they are seeking the Word, too, in hopes of seizing the powerful knowledge within it and calling forth a powerful creature known as the Erlking. Butcher's latest maintains the momentum of previous Dresden outings and builds the suspense right up to a rousing conclusion.