Black Magic Killers | 
so-soThis one has a much better menagerie of information, and seems to be researched better than the other 2 in my set (Serial Killers by Collin & Damon Wilson; Cannibal Killers by Peter Haining). Still, you wouldn't really read this book in 1 sitting but perhaps use it as a reference/intro guide to the subject(s).
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