Moriarty

It was a long time ago, too long ago. They met by chance; he was already a second-year student, and she was about 15. Jim Moriarty was four years older than she. Then their paths diverged; after graduating, he became a villainous consultant. And they haven't seen each other since.
The man became Sherlock Holmes's enemy, a famous and rich villain, but he still carried around a Snickers bar, the little candy bar that the girl loved.
Now he is 30, and she is 26. They had not seen each other for a very long time and did not recognize each other right away, no, he recognized her by the birthmark on her neck in the shape of a crescent moon, she did not recognize him.
Now she worked for Sherlock.
And that was the moment when Sherlock and Jim were on the roof and suddenly a girl came in there.