Overall a good book in the Cal series, though not as good as some of the ones that came before it. The writing is strong as always and the general feel of the story is enjoyable to read. I think it adds a lot to potential plot threads and opens up the story to go some pretty interesting places.
That said, one of the things that didn't work as well as it should have in this book was the foreshadowing. There are a couple moments where you see it, and unfortunatly it's pretty blatant when you do come across it. This leads to you not really being surprised at all when those events crop up later on in the story and leaves you feeling a little saddened by something that could have been a "Wow" moment.
But that aside, and the entire thing with the Pucks, which though interesting and does give some insight as to Goodfellow's history and how the Pucks fit into the general world, doesn't do much else within the plot line other than something that just sort of happens in the beginning. (though to be honest, it does set up some nice plot hooks for later use so I can't really complain)
All in all, this was a good book in the series. Not the strongest, but it does set a lot of stuff up for later novels and stops the series from stagnating like many of the other Paranormal genre books. It will be interesting to see where Thurman takes this series with everything she's set up.