A MYSTERIOUS MASKED FIGURE ROAMS THE UNDERGROUND CHAMBERS OF THEOPERA POPULAIRE, A 19TH CENTURY PARISIAN OPERA HOUSE. HE TUTORSA YOUNG SINGER WHO RISES QUICKLY TO STARDOM. THE MASKED FIGUREBEGINS TO HARBOR ROMANTIC FEELINGS FOR HIS PUPIL, BUT HIS HOPESARE DASHED WHEN THE SINGERS CHILDHOOD BOYFRIEND ARRIVES IN PARI