Paris, 1920s. Marguerite Dumont is a wealthy baroness who loves music, particularly opera, and adores performing for her dearest friends. However, her voice is actually jaw-droppingly awful, yet has remained blissfully unaware of this fact as both her friends and husband have kept her fantasy of her talent alive. The problem starts when she decides to perform to a real audience in Paris.

Loosely based on the true story of American socialite Florence Foster Jenkins, Catherine Frot (The Page Turner) gives a heartfelt and tender performance as the passionate and obsessive Marguerite.