She is James Moriarty, the most dangerous criminal genius in London and the person Holmes spent his life trying to catch.
On the edge of the cliff of the Reichenbach Falls, she took off the silver chain that never left her body, left it to the opponent who had been looking at each other for fifteen years five steps away, and then jumped. Everyone thought she was dead - including Holmes.
Ten years later, there was a knock on the door at an office in Charing Cross Street.
"I heard you were looking for an office."
She stood at the door, still with the gray hair on her temples. Her ribs were broken and her shoulders were dislocated. When a Swiss peasant woman rescued her, she suffered from fever for half a month. But now she was alive, standing here, asking him if he wanted an office.
And he still wore the silver chain on his wrist.
This is a story about waiting. About how two people standing at opposite ends of light and darkness can identify the only light in their long destiny. It's not redemption, it's not whitewashing, it's just two too smart people who finally learned the stupidest thing -
Waiting for you to come back.
Intent: To identify the only light in absolute darkness