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.

Convinced that only she can lead France to victory against the invading English, Joan of Arc leaves her childhood home to plead Charles, heir to the French throne, to allow her to guide his troops on the battlefield.

An unorthodox police commissioner investigates the suspicious death of a man run over by a train.

A scientist from the East happens in France where it is supposed to improve one of his inventions. But it is much more interested in the fact to enjoy it and have fun ...