The Sherlock Holmes universe is the creation of Arthur Conan Doyle, comprising four novels and fifty-six short stories published between 1887 and 1927. Set primarily in late Victorian and Edwardian London, it follows the consulting detective Sherlock Holmes and his companion Dr John Watson across a career spanning several decades. The universe is defined by its central dynamic - Holmes's extraordinary powers of observation and deductive reasoning applied to cases ranging from the mundane to the genuinely bizarre - and by Watson's role as narrator and audience surrogate, whose admiring but grounded perspective mediates Holmes's more alien qualities for the reader. London itself functions as a character, its fog, gaslight, and social stratification providing both atmosphere and the conditions that make Holmes's work necessary. The fixed, closed canon and its public domain status have made it one of the most studied and adapted fictional universes in existence.