<Li> Meg Giry: Often referred to as "Little Meg", Madame Giry's only daughter, a ballet girl . Later becomes Madame la Baronne de Castelot - Barbezac . </Li> <Li> Debienne and Poligny: The previous managers of the opera house </Li> <Li> Joseph Buquet: The chief scene - shifter . </Li> <Li> Carlotta: A spoiled prima donna; the lead soprano of the Paris Opera House . </Li>

What is the storyline of phantom of the opera