The young heroines are the "Petits Rats de l'Opéra" =pupil of the opera of Paris ballet class .One of them,Delphine,wants to be a ballerina.It's her wildest dream.But alas,in the wake of a night on the roof of the opera -a forbidden place- ,she is fired -and however she was not alone on that roof,her friends were with her!Delphine is desperate and she hides the terrible truth from her mother .What will become of her?