Sherlock Holmes, a fictional character of the late 19th and early 20th century created by Scottish author and physician Sir Arthur Conan Doyle, is a brilliant London-based "consulting detective" famous for his intellectual prowess and renowned for his enormous scope of observation, his astute logical reasoning and forensic science skills in solving difficult crimes. The Memoirs of Sherlock Holmes is a collection of Sherlock Holmes mysteries, including The Final Problem in which Holmes confronts his arch-nemesis Professor Moriarty.