I'd not heard of the Dresden Files before the show, but didn't realize or had forgotten they were based on a series of books. I recently was reminded of that and, using my trusty Kindle, started to read the series. I've now read all the novels from Storm Front to Changes, all in the last month or two. I'm glad to hear there will be more.
I liked the TV show, but it was too low budget for the stories the way they did. Plus I remember reading that they did not air the shows in the order they were shot. This made the ownership of the charaters in the show shaky, as we would see them somewhat comfortable in their roles and then not so much. And powers or props demonstrated in an earlier episode are not apparent in ones that follow.
Blackthorne was reasonably cast but was written too weak for the role, like he was always out of his league and not in possession of the raw power he shows in the books. It's like the show had a lot of cards stacked against it (much like against the Dresden character in the novels), but because of that he didn't come across as strong or smart enough to draw you into the show. I think all this contributed to the show's downfall.
I think Morgan was cast well, but Valerie Cruz (as good as she looks) was far too tall for the part (she's over 5' 8" and we all know Karin M's character is supposed to be far closer to 5 feet).
Anyway, I'm waiting for the next book to see what happens and find out
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My vote is either for the Nickleheads (taking revenge) or Kincaid (as this was his stated way to safely kill a wizard and avoid a death curse). It was proabably just a contract to him, nothing personal.