Frederic, who is shy and sensitive, and Hugo, who is heartless and aggressive. Frederic is in love with a hussy who is in love with Hugo. To save Frederic from an unhappy marriage, Hugo tries to distract him by bringing to a ball a beautiful dancer who masquerades as a mysterious personage and becomes the triumph of the occasion. She is a susceptible maiden in her own right. She not only breaks up all the cynical romances that have been going on before she arrived, but loses her own heart as well.