Two of the most famous cases of Sherlock Holmes, that take place immediately after the introductory ones of "A Study in Scarlet" and "A Scandal in Bohemia". Arthur Conan Doyle presents us with a puzzling case in "The Red-headed League" and a fascinating expansion of Sherlock's methods and motivations in "The League of the Four". Both cases are essential to understand the characters and the development of the universe of Holmes and Watson. We present both stories in the official edition, without external introductions, irrelevant footnotes, or alterations of any kind.