Typically lighthearted musical starring Durbin in a Viennese setting. Ilona (Durbin) goes to a fair and buys a card from a gypsy fortune teller promising she'll meet someone important and have a happy marriage. She gets a job as a baker's assistant and meets army drummer Harry (Cummings), who secretly composes music. Ilona includes sheet music for one of Harry's waltzes in the pastry order going to the Austrian Emperor and it paves the way for the gypsy's predictions to come true.