Death Masks - The Dresden Files, Book Five

Meet Harry Dresden, Chicago''s first (and only) Wizard P.I. Turns out the ''everyday'' world is full of strange and magical things - and most of them don''t play well with humans. That''s where Harry comes in.
Harry Dresden should be happy that business is good - makes a change. But now he''s getting more than he bargained for: a duel with the Red Court of Vampires'' champion, who must kill Harry to end the war between vampires and wizards; professional hit men using Harry for target practice; the missing Shroud of Turin (less missing than expected) and a headless corpse the Chicago police need identifying . . . Not to mention the return of Harry''s ex-girlfriend Susan, still struggling with her semi-vampiric nature. And who seems to have a new man. Some days, it just doesn''t pay to get out of bed. No matter how much you''re charging.
Magic - it can get a guy killed.