Yeah, the conclusion I drew was that the point was for them to implicate Mycroft's brother as the one who revealed the secret. And that the point was that Irene wanted to mess with Mycroft and Sherlock- I continue to think Moriarty is a nonentity in this. The whole episode that introduced him had a ventriloquism theme, so he obviously has to be someone's puppet.

In any case, the mystery was not so much for the sensemaking. I told mllesays that it seemed like this was a story much more about the mysteries of love and sexuality than it was a puzzle story. But the biological determinism of the pulse thing annoyed me if that was, as mllesays suggests, intended to be the 'solution' to the mystery of love.