“Yet from the outset the fascination with private detectives was mixed with aversion. They were untrained and unregulated and often had criminal records themselves. Beholden to paying clients, they were widely seen as surreptitious figures who burglarized people’s secrets. (The term “to detect” derived from the Latin verb “to unroof,” and because the devil, according to legend, allowed his henchmen to peer voyeuristically into houses by removing their roofs, detectives were known as “the devil’s disciples.”)”