Jim Butcher: Dresden Files, Books 1-4: Storm Front, Fool Moon, Grave Peril, Summer Knight

Harry Blackstone Copperfield Dresden is the Chicago area's only openly practicing wizard and a dedicated private eye. He is also dead broke. His vast knowledge and magical skills are unfortunately matched by his talent for making powerful enemies and alienating friends. With rent past due and a decent meal becoming an issue of some importance, he accepts an offer of work from Lt. Karrin Murphy of the Chicago PD Special Investigation Unit - a force tasked to deal with the strange cases no one else wants to get involved with, let alone attempt to solve. Harry finds himself pitted against a multitude of supernatural bad guys in this exciting collection - demons, poltergeists, sorcerers, trolls, vampires, werewolves, and even an evil faerie godmother can't keep a good wizard down!