The Final Problem is a short story by Sir Arthur Conan Doyle featuring Sherlock Holmes. The story is set in 1891 and we are introduced to Sherlock Holmes’s greatest opponent, the criminal mastermind Professor Moriarty. Moriarty realizes that his devious plots won’t be successful unless Sherlock Holmes is stopped. Permanently. I won’t go into the plot (much) because that would ruin the book for you. Sir Arthur Conan Doyle later ranked [...]