Episode Description: Beware, spoilers! To read - hover over the text.
When Joan moved out from Sherlock, he nearly went mad. He went to London. Saved him from the sad thoughts of a young curious girl kitty, who also tried to help the police. They became friends in new York moved. Holmes knew about the past of the girl and that she was deadly frightened. Fear lives in her still. What she learned tormentor in Gruner, brought this fear out. She caught Gruner and is now going to get even with him.