A Study in Scarlet (1887) is the first novel written by Arthur Conan Doyle, introducing the iconic characters of Sherlock Holmes and Dr. John Watson. It is a classic detective story that lays the groundwork for the long-running Holmes-Watson partnership.

A Study in Scarlet is a crucial starting point for the Sherlock Holmes canon, not only introducing the detective's methods and character but also setting up the dynamic between Holmes and Watson that will define the entire series. The novel mixes thrilling detective work with emotional and moral complexity, making it a compelling read for fans of mystery and literature alike.