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Sir Arthur Ignatius Conan Doyle (1859-1930) is an English doctor and writer whose name is inextricably linked to the legendary literary hero, the detective Sherlock Holmes, who knows the deductive method as well as the bow of his favourite violin. The "highlight" of the "recluse from Baker Street", who has no equal in his ability to solve the most complex crime, is his intellectuality, irony and spiritual aristocracy. The characters of Sherlock Holmes and his friend Dr Watson were shown so vividly that they seemed real. Later, the Sherlock Holmes House appeared on a modest London street, Baker Street, and now receives millions of visitors from all over the world every year. Holmes himself entered the Guinness Book of Records as the most filmed literary character."

The story "A Study in Scarlet" (1887) opens a series of works about the famous detective Sherlock Holmes and his companion Dr Watson - a compassionate story of love and revenge, which ended in several murders in London, which led the police to a dead end.

In The Sign of Four (1890), Holmes and Watson investigate the case of a poor girl, Mary Morstan, who suddenly finds herself a wealthy heiress, but not for long.