The Murders in the Rue Morgue Poe's Dupin displays many traits which became literary conventions in subsequent fictional detectives, including Sherlock Holmes and Hercule Poirot. Many later characters, for example, follow Poe's model of the brilliant detective, his personal friend who serves as narrator, and the final revelation being presented before the reasoning that leads up to it. Dupin himself reappears in "The Mystery of Marie Rogêt" and "The Purloined Letter". The unnamed narrator of the story opens with a lengthy commentary on the nature and practice of analytical reasoning, then describes the circumstances under which he first met Dupin during an extended visit to Paris.
Masque of the Red Death and Other Tales setting's fine, but it's a sidebar to the system overhaul. "Masque of the Red Death" makes a persuasive case for reality-based role-playing, where wits count more than muscle and a shotgun packs more punch than a fireball. Endearingly human, these are the only "AD&D" game characters I'd consider using as investigators in a "Call of Cthulhu" game or, for that matter, as adversaries in a "Vampire" campaign. And nitpickers who've been clamoring for a streamlined, skill-based "AD&D" game ought to be dancing in the streets. "Masque of the Red Death" doesn't qualify as the Third Edition of the "AD&D" game,