A Study in Scarlet is a mystery detective novel written by Sir Arthur Conan Doyle. It is one of his most famous novels and it is the novel that introduces the characters of Sherlock Holmes and Dr. Watson. Sir Arthur Conan Doyle would eventually go on to write dozens of short stories and four full length novels that feature Holmes and Watson. A Study in Scarlet is highly recommended for those who enjoy Sherlock Holmes detective novels and other works by Sir Arthur Conan Doyle.