Nice first book, clearly trying to create (on link to?) to its own universe, defining the first big quest and starting a big arc.
I'm curious to know where it will lead — but clearly it has all the landmark of the current urban fantasy. Even hints at the others wizards in Chicago and Las Vegas, the marked one in New York with his pets, some fancy Druid... And bigger baddies that lurks in the shadow, never dead.

Curious to see how all of those will land at the end.