I don't think anyone has mentioned Chelsea Cain - her Archie & Gretchen "Heartsick" series. Gretchen Lowell truly is the finest successor (alongside Dexter Morgan) to Hannibal Lector - as a completely evil, soulless, brilliant, manipulative, and yes - likeable - serial killer. Start with Heartsick, if you're snagged - read them in order.
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http://www.amazon.com/Heartsick-eboo...9263578&sr=1-2)