Paris in the 1920s. Marguerite Dumont is a wealthy woman with a passion for music and the opera. For years, she has performed regularly for a circle of guests. But Marguerite sings tragically out of tune and no one has ever told her. Her husband and her close friends have always encouraged her in her illusions. Things become very complicated the day she gets it into her head to perform in front of a genuine public, at the Opera.

Three brothers leave their home to see the world. During their journey, young men as by miracle enter into famous fairy tales (Little Riding Hood, Sleeping Beauty, Twelve Months) and face traps, unexpected moments and even love in a story full of humor and songs.