L'amour masqué is a comédie musicale in three acts with music by André Messager and a French libretto by Sacha Guitry, based on the work by Ivan Caryll.

Elle, charming and beautiful, is about to celebrate her twentieth birthday; she is not in love with her two rich suitors, the Baron Agnot and the Maharadjah, but takes advantage of their generosity.

Finally, Lui comes to retrieve the photograph; as he not that young, he makes her believe that the photo is his son, as whom he will appear, in disguise, at the ball to which Elle invites him.

Lui arrives, masked; Elle will give way to the man whom she takes to be the son of her morning visitor.

Despite the age difference, she does not worry about one who seemed so young in the intimacy of the night – she has two lovers in the same person: the father and son.