Marie-Grace is excited that a well-known English opera company will perform in New Orleans - at the same theater where she takes singing lessons from Aunt Océane. Even better, her aunt has gotten a role in the opera. As Marie-Grace and her friend, Cécile, help out during rehearsals, they're thrilled to meet real opera stars and get a peek into theater life. But thrills turn to chills as the girls make disturbing discoveries behind the scenes! An illustrated "Looking Back" essay describes New Orlean's place as a leading cultural center for opera in theater in 1800s America.