Harry Dresden fights crime. He's got a list of personal problems as long as your arm, including a contorted wreck of a love life, a smart-arse attitude, and the fact that everyone in all kinds of authority is against him. Oh, and he happens to be a wizard. He's even listed as such in the Chicago phone book.
This is a fun series; the tone can be quite dark, and the prose isn't going to win any prizes, but it's a very complicated world, drawn very matter-of-factly, and this is what makes it an enjoyable read. But don't start with the eighth book.
[[Jim Butcher's Dresden Files in Chronological Order]]