[s1e12] | M.

Emotionally, the episode is defined by Joan Watson's choice. Despite her contract ending, she chooses to stay with Sherlock pro bono because she finds his work fascinating and believes she can truly help him.

Sherlock reveals to Joan Watson that he believes "M" is responsible for the death of Irene Adler , the only woman he ever loved. This loss is what originally sent him spiraling into the drug addiction that brought him to New York. [S1E12] M.

This revelation leads Sherlock to the realization that Moran is just a "dragon" for a much more dangerous employer: the legendary Moriarty . Why This Episode Matters Emotionally, the episode is defined by Joan Watson's choice

In this episode, a serial killer from Sherlock's past in London appears to have followed him to New York. This loss is what originally sent him spiraling