"A Study in Scarlet" is a detective novel written by Arthur Conan Doyle, first published in 1887. It introduces the iconic character Sherlock Holmes, a brilliant detective known for his keen observation and logical reasoning. The story is set in London and follows Holmes and his friend Dr. John Watson as they investigate a mysterious murder. The novel is divided into two parts. The first part focuses on the investigation of the murder of Enoch Drebber, while the second part delves into the backstory of the crime, revealing connections to Mormonism and themes of revenge. This work laid the foundation for the enduring popularity of the Holmes character.