By Mandi Bierly
Updated April 08, 2011 at 05:18 PM EDT

The third book in Richard Castle’s Nikki Heat series hits shelves (for real) in September, and EW has obtained a plot description from Hyperion, which has already published two New York Times best-sellers from the crime novelist Nathan Fillion plays on ABC’s Castle, Heat Wave and Naked Heat.

Sounds like Castle did some research during episode 216, “The Mistress Always Spanks Twice.”

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