I think this is the best of the series so far. Although other characters and situations are mentioned, this is more of a stand-alone book in the same world. This one is all about Earl Harbringer. It does include a good bit of his back story, but it is spaced out through the book. The main story is about Earl and agent Stark being trapped without backup in a small town being terrorized by monsters.
I really liked the first one, but the second was a little disappointing, it was just too similar to the first book. Maybe I just like Earl better than Owen as the primary character. I know there are more books planned, but I'm not sure if the others will all go back to the main story line.