Castle

Season 2, Episode 16

Episode Title: The Mistress Always Spanks Twice

Air Date: 2010-03-08

Overview:

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.