Subtrope of Great Detective. A sleuth who is known to belong to the higher strata of society - to have been raised in a privileged environment, and shows it, even if they have since rejected their background. Will tend to be some form of polymath, possibly autodidactic, at the least being very well-educated and well-read. Probably multilingual to boot, and often has notable eccentricities or unusual hobbies. Frequently a competent musician. Like the Great Detective, this was first instantiated in the form of Edgar Allan Poe's C. Auguste Dupin, and popularised by Arthur Conan Doyle's Sherlock Holmes.