'A Study in Scarlet' is an 1887 detective novel by British writer Arthur Conan Doyle.

The story marks the first appearance of Sherlock Holmes and Dr. Watson, who would go on to become one of the most well-known detective duos in literature.

When a gruesome murder is discovered with the word 'RACHE' scrawled in blood, Sherlock Holmes uses his unique powers of deduction to uncover a hidden story of passion, betrayal, and retribution.