First of all the crime story it's self is very good. Very well written. It had some twist and turn, there is also many suspect(as usual in Castle). But to me, the bad guy is somewhat obvious from the start. Character Development is on mark in this one, but most of all I look at this one as more of a humors episode. It has some very cute family moment. And many many moment that made me laugh as usual. XD
In addition of humor that made me love this episode, there is reason of crime. In all the Castle story's, this one is the saddest. It was a very moving moment when the husben listing to the first part of the tape. I never fell sorry for a bad guy so much as in this one. I can even say I understand the why he did it. We do all kind of things for/because Love, Both the good and bad. In someway it's the love that made us human and also because of it, we could become a evil monster. In this case a moment of jealousy coast yound woman life and eternal regret of a young man.