Arthur Conan Doyle, Leslie S. Klinger, John le Carré "The New Annotated Sherlock Holmes, Volume 1"
W. W. Norton & Company | English | November 5, 2007 | ISBN: 0393059146 | 650 pages | azw, epub, lrf, mobi | 43,1 mb
I think it's pretty indisputable that this material is classic and great fun to read. The annotated edition is helpful in understanding issues of Victorian London that might slip by you otherwise. But mostly, the commentary is just plain entertaining as it showcases the insanity of Holmes enthusiasts.