After Anatomy of a Murder, this is my favorite episode! Loved when Castle reassured Beckett in the end about their relationship status. It was too cute. I hope Jim and Martha won't become a couple, it would be just too weird, although I was glad to see them makeup. Can't wait for the Christmas special in two weeks.
Also, I'm overly jealous of Caskett's grandchildren. Helluva stories they got there.