Sorcery and Cecelia!! Maybe Emily could become custodian of an enchanted chocolate pot! Or maybe not.

Must admit I cheered when Irene Adler made her appearance.

I can see this spinning off in many intriguing directions. I like all of the above suggestions and would not be opposed to nefarious courtly plots, derring-do, gothic castles, fantasical buried treasure or even smoky opium dens.