Jim Butcher's The Dresden Files Welcome to the Jungle

Harry Dresden is the best at what he does. Well, technically, he's the only one at what he does. So when the Chicago P.D. has a case that transcends mortal creativity or capability, they come to him for answers. For the "everyday" world is actually full of strange and magical things -- and most of them don't play well with humans. That's where Harry comes in. Takes a wizard to catch a -- well, whatever.

There's just one problem. Business, to put it mildly, stinks. So when the police bring him in to consult on a grisly double murder committed with black magic, Harry's seeing dollar signs. But where there's black magic, there's a black mage behind it. And now that mage knows Harry's name. And that's when things start to get... interesting. Magic. It can get a guy killed!