In the hospital, Cahill sneaks a hypo from a crash cart. He enters a patient's room and starts to inject an IV tube. Holmes busts in and Cahill is dragged off. But then! The hypo was empty; he was trying to steal morphine from a PC machine.

Brownstone. Holmes yells at himself for not recognizing Cahill's twitchiness. But he doesn't care about him anymore, because he's concentrating on the murder. All twenty-three of the people on his list are no longer suspects. But then! Watson notes that Samantha Cropsey, the second-to-last victim, was not terminal. She had a Coronary Artery Bypass Graft, but she wasn't going to die. So why did the Angel make an exception? Gregson calls. Cahill's talking! He's got some sort of information for them!

Interrogation room. Cahill explains that he's wiped out and keyed up after a shift, so he can't sleep without the morphine. Holmes isn't all that interested. Anyway, a couple months ago, he snuck into a room that turned out to be an Angel's victim. He snuck into the bathroom to... Holmes interjects: "I believe the words you're looking for are 'shoot' and 'up'." The way he says this is very Blackaddery. I think it's the way he enunciates the "p" in "up." If you're wondering why I gave this episode such a high grade, it's because there have been a lot of little moments like this that I've really enjoyed. The show overall is still a standard procedural that uses the name Sherlock Holmes, but things like that can make it stand out for me.

Anyway, when Cahill went to leave, he saw someone coming into the room. He didn't recognize the guy's voice, but he and the patient talked for an hour. The doctor went into detail about how the patient was going to die. Gregson sneers that Cahill needed a new morphine source, which makes Holmes glare at him.

Holmes and Watson! Talking things over! Holmes says that the Angel's approach as described by Cahill is exactly like the one perfume-lady described. So they know more about his methods!

Back to the hospital, but only with Watson. She asks Carrie to run a better test for endocarditis, because the one that Morgan passed is only accurate 75% of the time. Carrie won't do it. Watson says if she operates on her, she could die. Carrie: "She'll be fine, Joan. I'm operating on her. Not you." Now the charitable way to read that is, "It's my decision. Not yours." But given that we know Watson accidentally killed a patient, it seems like Carrie could be saying, "I'm doing the operation. Not an incompetent like you."