Sherlock: Alice.
Alice: It’s been too long, Sherlock Holmes. Interesting case?
Sherlock: Better. 
Alice: Moriarty.
Sherlock: Yes. To what do I owe this visit?
Alice: Has he been keeping you occupied with another little game, then? I can only hope for your sake that he’s developed some imagination since your last little tryst.
Sherlock: Jealousy doesn’t suit you, Alice.
Alice: Do you want to catch him more than you want to catch me?
Sherlock: At the moment, yes. I’m running out of time.
Alice: Because if I thought you were about to lose interest in me, I’d be inconsolable.
Sherlock: You haven’t bored me yet.
Alice: Are you trying to beguile me?
Sherlock: No, I wouldn’t be so foolish. Why are you here?
Alice: I want to help you.
Sherlock: I find it highly improbable that you would presume that I need your help, much less that you would be here without an ulterior motive. Why are you here?
Alice: You need me
Sherlock: No. I’m tolerating you, there’s a difference. What I need is to figure out where Moriarty has made a mistake and catch him out before he levels half of London, and, as I’m sure you’re aware, you’re incredibly distracting.
Alice: Flattery to appease a malignant narcissist. That’s a frivolous tactic. 
Sherlock: Did it work? 
Alice: …Yes. Moriarty is just a naughty child, showing off. You don’t need a mistake, you already know his flaw — his compulsion to dominate, to be in control — and you already know how to exploit that. 
Sherlock: How? 
Alice: Oh, come on. Change the state of play. 
Sherlock: I tried that with you and it failed. 
Alice: Only just. 
Sherlock: …Are you trying to beguile me?