I am currently reading my way through a long list of science fiction and fantasy titles. (http://www.npr.org/2011/08/07/138938145/science-fiction-and-fantasy-finalists if you are interested in the list).
These seem to be a hodge-podge of dark little stories. The one supposedly penned by Mr. Holmes himself is almost exactly the style used in the Watson-authored stories. Sir Arthur had really, really fallen out of love with his creation, methinks.