The Sign of Four was the second novel featuring which famous fictional detective, following A Study In Scarlet?
Arthur Conan Doyle Sir Arthur Ignatius Conan Doyle KStJ, DL (22 May 1859 – 7 July 1930) was a British writer best known for his detective fiction featuring the character Sherlock Holmes. Originally a physician, in 1887 he published "A Study in Scarlet", the first of four novels about Holmes and Dr. Watson. In addition, Doyle wrote over fifty short stories featuring the famous detective.
Richard Hull (author) Richard Henry Sampson {'1': ", '2': ", '3': ", '4': "} (16 October 1897 – 1973), known by the pseudonym Richard Hull, was a British writer who became successful as a crime novelist with his first book in 1934.