Sherlock calls her, in their last moments together, "Mrs. Sanger". The suggestion, I thought, is that she was young Margaret Sanger, fighting for medical integrity by having to disguise herself as a man.

I ate it up and loved it to pieces, the clunky suffragist terror cell excluded, which seemed a better idea than as executed—as Allison Shoemaker aptly puts it—entirely via a male perspective and merely in service of an unrelated insight.