In our time, there are not enough people with the logic and insight of Sherlock Holmes - this is eloquently evidenced by the crime stories collected in this book - but the investigations of the famous detective still excite the minds of our contemporaries. There are also those who do not doubt its reality, and Conan Doyle is considered only its chronicler. Perhaps the writer's missing manuscripts will help solve this problem? An attempt to unravel the mystery of the missing archive cost the life of Richard Lancelyn Greene, a fan and researcher of Conan Doyle's work.