Holmes and Watson meet up at the morgue to look at the corpse of Ian Vickers. Watson says the oil in the hair suggests that he was dropped at the Brooklyn Navy Yard. "I'm gonna miss this," she admits. "Maybe not this so much." Meaning hanging out in the morgue. "But this. Working with you. I think what you do is amazing." She has a whole speech prepared about it. She decided not to wait for their wrap-up dinner, because that's probably not going to happen. Holmes looks nonplussed, because of her heartfelt speech, not because the dinner isn't happening. Probably.
Brownstone. It's after eleven, so Watson wants to talk about what to order. Holmes tells her to shut up because there's a note taped to a lamp. Holmes: "I believe our home has just become a crime scene."
The note says: "Men make plans. God laughs. I am laughing at you now, as I always have. You think you honour me with your pursuit. You do not. You are a mouse chasing a lion, a mere planet in orbit of a raging sun. -M" It looks like letters cut out from magazines, but in this shot, it actually looks more like a printout not little bits of paper taped down.
In the next shot, though, Gregson reads the note and this time it's definitely clippings of paper attached to a bigger sheet. Holmes says the lock on the back door was picked. Gregson wants to send Holmes and Watson to a safe house, but Holmes figures M wants the game, not to kill him. He claims to be safe as houses. And Watson says she goes where Holmes goes. So she's staying. Gregson's attempt to protect their lives is foiled.
Later, Watson is about to go to bed. Holmes is on the Internet looking at a different abandoned home his father owns. I will briefly mention that the picture on the web page has a bunch of white powder on it. No reason! Just thought I'd make sure that important plot point got mentioned. Don't worry about it! Holmes is just looking for a possible new home. He's not worried about M's note, but he's still not delighted that his house isn't madman-proof.