The French ballet girl Janine, a gifted tap-dancer, dreams of a musical career in Paris. But first she wants to take revenge on Count René who stood up her best friend Charlotte. Janine wants him to fall in love with her and disappoint him afterwards. At a masked ball at which Janine pretends to be a Marquise they have their first meeting. Janine is very disappointed in the "good gentleman", but she does not suspect that this gentleman also makes a pretense. The man whom she holds to be count René is Pierre, a composer and pianist. Both, Count René and Pierre expect to gain mutual advantage by changing their identities. Rene wants to stroll and make conquests incognito, while Pierre hopes for a meeting with the powerful music publisher Pamion.