Answer: a study in…..
Some extra relevant information:
Sherlock Holmes, the iconic detective created by Sir Arthur Conan Doyle, made his first appearance in the novel “A Study in Scarlet.” Published in 1887, this intriguing detective story introduced readers to the brilliant mind and exceptional deductive abilities of Sherlock Holmes. In “A Study in Scarlet,” Holmes teams up with his loyal companion, Dr. John H. Watson, as they navigate a complex murder case involving revenge, secret societies, and a cryptic message written in blood. This novel not only marked the debut of Sherlock Holmes but also laid the foundation for countless adaptations, movies, and TV series that have brought this beloved character to life in various forms of media.