Thanks to NetGalley and Arcturus Publishing for an advance copy in exchange for an honest review.

tl;dr
An easily readable adaptation of one of the lesser-known Sherlock Holmes mysteries, including a very adventurous treasure hunt.

About
Watson discovers a collection of souvenirs from some of Holmes' old cases and asks him to recount one of them - in this case, the story of a missing butler and a strange ritual handed down over generations. Conan Doyle's "The Musgrave Ritual" adapted for young readers complete with illustrations.

Thoughts
Reviewing one of the original Sherlock Holmes stories feels weird at this point, as most of them are probably already in the cultural zeitgeist. But since this one is probably a little less well known, I'll give it a quick review: This one bears markers of Edgar Allan Poe's influence, reminiscent of The Gold Bug and the rather famous Cask of Amontillado, to make a thrilling treasure hunt/murder mystery that might be one of the darker tales in the Sherlock Holmes canon. The actual solution to the mystery is much simpler than a real-world version of the same puzzle - which might be a good talking point to discuss with brighter young readers afterwards, as an introduction to some basic astronomy, nature, and math. In terms of adaptation, the writing is very accessible. The story is broken up into short, digestible chapters, that make for easy reading. Illustrations, of which there are many, are cartoony and charming, although the murderer is certainly drawn with a bit more terrifying of a look. Overall, a good starting point for young readers, or a good addition for anyone wanting to read beyond the more famous Holmes adventures.