This document provides an overview of detective stories and Edgar Allan Poe's contributions. It defines a detective as someone who investigates and solves crimes. Detective stories introduce a crime for the detective to investigate. Poe is considered the father of detective fiction for introducing key elements in stories like "The Murders in the Rue Morgue", including the amateur detective C. Auguste Dupin. The document then summarizes Poe's short story "The Purloined Letter", where Dupin is able to find a stolen letter by realizing it was hidden in plain sight rather than an elaborate hiding place.