The Mystery of Marie Roget is more faithful to its Edgar Allan Poe original than most Universal films of its ilk, even though the Poe story and the film aren't exactly twins. Based on the factual unsolved 1842 murder of one Mary Rogers, the film stars Maria Montez as the unfortunate heroine, a popular Parisian entertainer. No innocent young damsel, Marie Roget spends a great deal of her time plotting the demise of her younger sister Camille (Nell O'Day). Shortly afterward, Marie herself disappears, and before long the mutilated, unidentifiable corpse of a young woman turns up. It is up to master detecive Dupin (Patric Knowles) and his Dr. Watson-ish assistant Gobelin (Lloyd Corrigan) to piece all the clues together. The film's best moments belong to Maria Ouspenskaya as Maria's sardonic grandmother.