

Celestin, a convent organist, has nicknamed the pretty Denise de Flavigny "Nitouche". The boarder has discovered that he leads a double life: at night, he composes light operas for his mistress, a young singer called Corinne. Nitouche, in order to avoid meeting the man she has to marry, hides in the theater's wings at the very moment when Corinne gets angry and refuses to perform. It is Nitouche who stands in for her, conducted by Celestin, who is in a state of great agitation but seems delighted. By chance, Nitouche bumps into her intended and ends up marrying him...