1921: not far from Paris, a party is being held at the famous Marguerite Dumont's mansion. Nobody knows much about the mysterious Marguerite except that she has devoted her whole life to her passion: music. As she takes centre stage, she sings enthusiastically but terribly out of tune. When a provocative young journalist decides to write a rave article on her latest performance, Marguerite starts to believe even further in her talent. This gives her the courage she needs to follow her dream - to perform in front of a crowd of complete strangers.