When Enola Holmes-Sherlock's teen sister-discovers her mother missing, she sets off to find her, becoming a super-sleuth in her own right as she outwits her famous brother and unravels a dangerous conspiracy around a mysterious young Lord.
https://www.imdb.com/title/tt7846844/?ref_=nv_sr_srsg_0
https://en.wikipedia.org/wiki/Enola_Holmes_(film)