Horror? Terror? Or a double helping of both? Here are two of Edgar Allan Poe's most popular stories—”The Tell-Tale Heart” and “The Pit and the Pendulum”—that make interesting companion pieces. In one, a murderous narrator grabs you by the collar and confesses his terrible crime; in the other, a political prisoner describes his relentless torture at the hands of the Inquisition. Which gives you the shivers?