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A Study in Scarlet is a detective mystery novel written by Sir Arthur Conan Doyle, introducing his new characters, "consulting detective" Sherlock Holmes and his friend and chronicler, Dr. John Watson, who later became two of the most famous characters in literature.

Conan Doyle wrote the story in 1886, and it was published the following year. The book's title derives from a speech given by Holmes to 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." (A "study" is a preliminary drawing, sketch or painting done in preparation for a finished piece.)

The story, and its main characters, attracted little public interest when it first appeared. Only 11 complete copies of Beeton's Christmas Annual 1887 are known to exist now and they have considerable value. Although Conan Doyle wrote 56 short stories featuring Holmes, A Study in Scarlet is one of only four full-length novels in the original canon. The novel was followed by The Sign of the Four, published in 1890. A Study in Scarlet was the first work of detective fiction to incorporate the magnifying glass as an investigative tool.

Sir Arthur Conan Doyle (1859-1930) was a Scottish physician and writer, most noted for his stories about the detective Sherlock Holmes, generally considered a milestone in the field of crime fiction, and for the adventures of Professor Challenger. He was a prolific writer whose other works include science fiction stories, plays, romances, poetry, non-fiction and historical novels.

Sherlock Holmes is a London-based "consulting detective" whose abilities border on the fantastic, Holmes is famous for his astute logical reasoning, his ability to adopt almost any disguise, and his use of forensic science skills to solve difficult cases.

Holmes, who first appeared in publication in 1887, was featured in four novels and 56 short stories.

Novels: A Study in Scarlet (1887), The Sign of the Four (1890), The Hound of the Baskervilles (1902) and The Valley of Fear (1915).

Short stories: The Adventures of Sherlock Holmes (1892), The Memoirs of Sherlock Holmes (1894), The Return of Sherlock Holmes (1905), His Last Bow (1917) and The Case-Book of Sherlock Holmes (1927).