In, “The Murders in the Rue Morgue,” Poe introduces the brilliant detective C. Auguste Dupin. When the Paris police arbitrarily arrest Dupin’s friend for the gruesome murders of a mother and daughter, Dupin begins an independent investigation and solves the case accurately. Uncovering evidence that goes otherwise unnoticed, Dupin concludes that a wild animal, an Ourang--Outang, committed the murders.
Edgar Allan Poe was the undisputed "Father" of the Detective Story. He created so much that is of importance in the field -- literally creating the template for all of detective fiction to follow.
In just three stories, Poe created the amateur detective and his narrator friend, the locked-room mystery, the talented but eccentric amateur sleuth outwitting the official police force, what Haycraft calls the "catalogue of minutia," interviews with witnesses, the first fictional case of an animal committing a perceived murder, the first armchair detective, the first fictional case which claimed to solve a real murder mystery previously unsolved by police, the concept of hiding something in plain sight so that it is overlooked by everyone who is searching for it (except for the detective, of course), scattering of false clues by the criminal, accusing someone unjustly, the concept of "ratiocination" (later called "observation and deduction" by Sherlock Holmes and others!), solution and explanation by the detective, and more. Other stories by Poe introduced cryptic ciphers, surveillance, the least-likely person theme (in one case, the narrator of the story is the murderer!), and other ingredients that have spiced up many a recipe for a crime story.
In his Auguste Dupin series, Edgar Allan Poe created a template for detective fiction. It was also first introduced in these stories