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.
Guinguette by the Seine Guinguette by the Seine (Fr. "La Guinguette a deux sous", "the Tuppenny Bar") is a detective novel by Belgian writer Georges Simenon, featuring his character Inspector Jules Maigret.