A Study in Scarlet and The Sign of Four Author:Arthur Conan Doyle This compilation features two of Doyle s novel-length Sherlock Holmes tales, A Study in Scarlet and The Sign of the Four. A Study in Scarlet is notable for introducing readers to Holmes and his beloved sidekick, Dr. Watson. The Sign of the Four expands upon Holmes character, humanizing literature s greatest detective by introducing his regrettab... more »le drug habit. As Doyle only composed four Holmes novels and limited the rest of his adventures to short story form, this compilation is a must for all Holmes fans and scholars.« less