Sherlock Holmes' 17-year-old niece Christie is just as intelligent as her uncle.
A lot of things are expected of a young aristocrat woman like her but she has little patience for banquets or corsets.
Although she appreciates the maids who care for her, she'd rather spend her time working on interesting cases.

In the opening of the manga she's on the trail of a mystery that has London in an uproar,
the "Case of the Old Russian Woman" in which Sherlock Holmes' greatest rival will appear! [tethysdust/MangaHelpers]