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.

TV host Kelly Ripa; Lady Antebellum performs.

Bachelor Jason Mesnick and Molly Malaney get married. Included in the episode are the wedding preparations and highlights of the bachelor and bachelorette parties.

When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.

Ezra Klein details the reconciliation process, and Tom Hanks discusses his role as a history maker.

Tonight's guest is fashion designer Isaac Mizrahi and musical guest Miranda Lambert.