"The Case-Book of Sherlock Holmes" by Arthur Conan Doyle is a collection of twelve short stories published between 1921 and 1927. This final set of Holmes mysteries marks the detective's last adventures, featuring cases narrated by Watson, Holmes himself, and even a third-person perspective. Set against the changing world of the 1920s, these stories experiment with new narrative styles as Doyle returned one final time to his legendary creation, though some critics consider them a lesser entry in the Holmes canon.