Title: The Mistress Always Spanks Twice
Air Date: March 8, 2010 at 12:00 AM PST
A half-naked woman covered in caramel sauce and hanging by bondage cuffs is found in a public park. The subsequent investigation takes Castle and Beckett into New York's underground world of sexual domination. Naturally, the case serves as fodder for their already flirtatious banter.