My latest Sherlock-themed crack theory is that not only is Mary meant to be Moran, Elsie Cubitt, and Carruthers, but maybe she is the "real" Moriarty as well. This is inspired mostly by the fact that when she was left alone for a little while in the Holmes' parents' den, she picked up... a book on abstruse mathematics ( Read more... )

I discovered this a few days via the wonder of YouTube's "related videos" feature and wanted to share:

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