Jamie Moriarty:  Would you be surprised to learn you 've been on my mind , Joan Watson ?
Dr. Joan Watson: Not really .
Jamie Moriarty: I do n't typically misread people , but you 're more clever than I initially anticipated . More interesting . If you were n't , I would never have been caught .
Dr. Joan Watson: I think you give me too much credit .
Jamie Moriarty: 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 ?
Dr. Joan Watson: Actually the partnership was his idea . That bothers you , does n't it ?
Jamie Moriarty: I confess I do n't understand it , but I 'm drawn to things I do n't understand . Same as Sherlock . Once I 've figured you out , I 'll move on . Same as Sherlock .
Dr. Joan Watson: Is that why you 've been writing him ? Because you want to ... understand him ?
Jamie Moriarty: Part of it , I suppose .
Dr. Joan Watson: And the rest ?
Jamie Moriarty: What do you think ?
Dr. Joan Watson: You think you 're in love with him . Only you ca n't be sure , because as much as you claim to know about the world , love is something you do n't quite get .
Jamie Moriarty: You 'd be surprised what I 'd do for love .
Dr. Joan Watson: Nothing crazy people do surprises me . '
Jamie Moriarty: 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 do n't understand that , you will someday . I promise .