What brilliant London-based detective, famous for his intellectual prowess and his skillful use of "deductive reasoning" was created by Sir Arthur Conan Doyle?

Sherlock Holmes is the brilliant London-based detective created by Sir Arthur Conan Doyle, known for his deductive reasoning and intellectual prowess. First appearing in 'A Study in Scarlet' (1887), Holmes became one of literature's most famous characters. John Watson was Holmes's companion and chronicler, not the detective. Ellery Queen was a detective created by other authors, and Henry Jekyll was a character from Robert Louis Stevenson's 'Strange Case of Dr Jekyll and Mr Hyde'.