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I also have this:
Whoever Fights Monsters, but haven't read it yet.
Seems to have better Amazon reviews.
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Looks like the reviews say that if you have read one book, that you've pretty much read the other too... but that the latter book is less sensational. I will probably roll with Ressler's book and see how I like it. Thanks for the recommendations.
Edit: I have also added Ghost Wars to my list.