Now, where to begin? To think Sherlock Holmes could have competition where world-class detective work is concerned is an idea that seemed quite far-fetched, that is until his little sister came along. Enola Holmes, Sherlock and Mycroft's 16-year-old sister has been brought up by their mother, Eudoria, as a strong, smart, and opionated young woman, much to Mycroft's chagrin. While Sherlock is a tad more empathetic towards Enola's rather unladylike leanings, Mycroft wants nothing more than force his 'ward', as he considers Enola, to educate herself in the Victorian way.

When Eudoria 'disappears' on Enola's 16th birthday, it's up to the teenage detective to put the clues together and figure out where her mother went, and if she wants to be found at all.