My thoughts on this episode was that it was very good, I like the way it was handled and how Joan used her awesome deductive skills to learn more about Sherlock and Irene by looking for that common denominator. Also, that killer guy must be one supersuave/convincing beast to get his son to kill those people for him, then again he really enjoyed throwing around the fact that he was really smart, just not book smart before. Also, that scene at the end made me think that Holmes lied about Irene and Watson's reaction when makes me wonder if she didn't see right through it. As she decided to leave him alone, during a time that he could probably use her support the most knowing full well that Irene the biggest reason why Holmes almost overdosed before going to rehab.