Original work of Arthur Conan Doyle

The Sign of the Four - Plot summary. The Sign of the Four is the second of Arthur Conan Doyle's Sherlock Holmes novels. In it the detective and his companion Dr Watson unravel a mystery of hidden treasure and murder. ... Holmes takes on her case and the adventure begins.

A Study in Scarlet is a 1887 detective novel by British author Arthur Conan Doyle. Written in 1886, the story marks the first appearance of Sherlock Holmes and Dr. Watson, who would become two of the most famous characters in popular fiction. The book's title derives from a speech given by Holmes, an amateur detective, to his friend and chronicler Watson on the nature of his work, in which he describes the story's murder investigation as his "study in scarlet": "There's the scarlet thread of murder running through the colourless skein of life, and our duty is to unravel it, and isolate it, and expose every inch of it." Cover by the wonderful @-capetown