Maurice Courtelin, a Parisian tailor (Maurice Chevalier), is owed a great sum of money by a viscount (Charles Ruggles). Stalling for time, the titled but penniless nobleman moves Maurice into the family chateau and passes him off as a baron. The beguiling Maurice soon charms the entire aristocratic household, except for the haughty Princess Jeanette (Jeanette MacDonald), who remains suspicious of him. But suspicion eventually gives way to love.