(from ebookjapan)

Late 19th century London: a 10-year-old girl, Crystal "Christie" Margaret Hope, happens to be the famous detective Sherlock Holmes's niece.
Armed with the deductive powers inherited from Holmes and a voracious curiosity, Christie takes on a variety of difficult cases.

One day, someone sneaks into Whitehall and steals expensive jewelry. After overhearing an outline of the case by chance, she deduces
in just three minutes what Holmes' partner Watson took three hours to find out and then confronts the culprit directly...!

Curator Note
While first volumes arcs and chapters are direct adaptations from Conan Doyle's novels and short stories
last two volumes are original Shintani scripts taking some inspiration from titles or Watson/Doyle's hints
to unpublished tales, The Giant Rat of Sumatra being the most well-known example