Killers of the Flower Moon: The Osage Murders and the Birth of the FBI

by David Grann

(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.”)

In 1850, Allan Pinkerton founded the first American private detective agency; in advertisements, the company’s motto, “We Never Sleep,” was inscribed under a large, unblinking, Masonic-like eye, which gave rise to the term “private eye.”