A Study in Scarlet（血字的研究）

A Study in Scarlet is a detective mystery novel written by Sir Arthur Conan Doyle, which was first published in 1887. It is the first story to feature the character of Sherlock Holmes, who would later become one of the most famous and iconic literary detective characters, with long-lasting interest and appeal. The book's title derives from a speech given by Holmes to his companion Doctor 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."

亚瑟·柯南·道尔：英国人，世界著名小说家。因成功地塑造了大侦探歇洛克·福尔摩斯的形象而成为侦探小说历史上最重要的小说家之一。除此之外，他还写过多部其他类型的作品，如科幻小说、悬疑小说、历史小说、爱情小说、戏剧和诗歌等。