Moriarty and Joan in “Unfinished Business”

Would you be surprised to learn you've been on my mind, Joan Watson?

Joan

Not really.

I don't typically misread people, but you're more clever than I initially anticipated. More interesting. If you weren't, I would never have been caught.

Joan

I think you give me too much credit.

It's what you crave, is it not? Acknowledgment from a superior mind. Evidence that you matter. Why else pursue a partnership with a man like Sherlock?

Joan

Actually the partnership was his idea. That bothers you, doesn't it?

I confess I don't understand it, but I'm drawn to things I don't understand. Same as Sherlock. Once I've figured you out, I'll move on. Same as Sherlock.

Joan

Is that why you've been writing him? Because you want to... understand him?

Part of it, I suppose.

Joan

And the rest?

What do you think?

Joan

You think you're in love with him. Only you can't be sure, because as much as you claim to know about the world, love is something you don't quite get.

You'd be surprised what I'd do for love.

Joan

Nothing crazy people do surprises me.

I write to Sherlock because he's the only person on the planet I can really talk to. He writes to me because I'm the only one he can talk to. The only one he can ever truly relate to. If you still don't understand that, you will someday. I promise.