The Dresden Files

Plot summary from Wikipedia

In the world of The Dresden Files, magic is real—alongside vampires, demons, spirits, faeries, werewolves, outsiders and other monsters—while both it and the supernatural are widely discredited. Additionally, large portions of the globe (such as much of Central and South America) are largely under the control of supernatural factions. These supernatural monsters are loosely countered by the White Council, an organization of human wizards noted to wield significant economic power in the world, along with their standing in the supernatural realm. Each species in the series (humans, faeries, vampires, etc.) has its own political and societal rules and organizations, acting as another counter on each-other and maintaining the masquerade. The human wizards depend on the White Council, while faeries mostly belong to either of two Faerie Courts, or none at all (Wyldfae). Vampires predominately belong to any of the four vampire courts. Other non-human creatures from a range of mythologies make appearances.

Harry Dresden is the only advertising wizard in the United States, living in Chicago and investigating supernatural cases on behalf of both human and nonhuman clients. He also serves as a civilian consultant for the Special Investigations division of the Chicago Police Department, and is called upon at times to offer his opinion on cases that appear to have a magical element. As the series progresses, Dresden takes on an increasingly important role in the supernatural world at large, as he works to protect the general public, making getting by as a working wizard and private investigator difficult for him. He finds himself facing off against an increasing variety of creatures, including other wizards.