Arthur Conan Doyle, Casebook of Sherlock Holmes, The, Part 1

And so, reader, farewell to Sherlock Holmes! These are positively the last stories. There is some disagreement as to their quality, and some claim that Conan Doyle was writing more experimentally, rather than to the conventional Sherlock Holmes formula. Not all the stories are narrated by the faithful Watson, and the stories are regarded as the darkest of the Holmes canon, with some unusual villains.