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

tl;dr
An easily readable adaptation, and a great introduction to Sherlock Holmes for kids, especially for someone looking for one of the mysteries that doesn't involve murder.

About
An old friend of Watson's writes, begging for help from the great Sherlock Holmes. An important document has gone missing, one that will have internationally catastrophic consequences if it falls into the wrong hands. Conan Doyle's "The Naval Treaty" adapted for young readers complete with illustrations.

Thoughts
At this point in time, I don't think I have to write much description of a Sherlock Holmes mystery. For anyone not familiar with this particular one, expect the usual - a vexing puzzle, a brilliant deduction, and a touch of drama. This story in particular is one of the several Sherlock Holmes mysteries that does not involve a murder, so anyone looking for an introduction to Holmes without the dead bodies that seem to follow might start here. 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. Overall, a good starting point for young readers, or a good addition for anyone wanting to read beyond the more famous Holmes adventures.