<b>The Mystery of Marie Roget</b> (1842) is Edgar Allan Poe's second story featuring his philosophic amateur detective the Chevalier C. Auguste Dupin. This intellectual super-sleuth made his first appearance the year before in <i>The Murders in the Rue Morgue</i> and appeared for the last time in Poe's 1844 story, <i>The Purloined Letter</i>.<br> <i>Marie Roget</i> is based on a real-life crime that took place in New York City in 1841 when the corpse of a young girl called Mary Rogers was found floating in the Hudson River. The original murder was never really solved - which is perhaps why Poe leaves his story technically 'unfinished'.