Castle
After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle receives permission from the Mayor of New York City to tag along with an NYPD homicide investigation team for research purposes.

Season 2 · Episode 16 ·
The Mistress Always Spanks Twice
When a half-naked woman is found covered in caramel sauce and hanging by bondage cuffs in a public park, Castle and Beckett's investigation takes them into New York's underground world of sexual domination. Naturally the case serves as sexy fodder for their already charged relationship banter.
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Episode 16 of season 2 of Castle: “The Mistress Always Spanks Twice”. Aired 2010-03-08. Watch it online free on ZapFlix.