Mary's ex-employer Mrs. Cecil Forrester comes to her for help after being blackmailed for thousands by the notorious Charles Augustus Milverton. Mary has to find something that will prevent Mrs. Cecil Forrester's secret from being revealed. Written by
Did You Know?
This was originally intended to be the last episode of the Mary Morstan Mystery series. But circumstances changed and, as a result, so did the script. The original scene in the alleyway with Mrs. Cecil Forrester and Mary ends with Mary realizing there are only two moustaches left in the present given to her by Sherlock to continue her undercover work and that, when they are gone, Horace Moustachio - her male alter ego - will be no more. She states that if he was likely to die, he should want to go down with a friend, meaning Cecil who also wears a moustache in the next scene. This ending was written but never shot. See more