Sherlock Holmes - A Study In Scarlet

chronicler, Dr. John Watson, who later became two of the most famous characters in literature.
The book's title derives from a speech given by Sherlock 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.