Julie Le Fabrier, a romantic young model in Madame Swan's dress shop, immediately falls in love with Lee Brooks after seeing a photo of the young millionaire in the paper. Soon afterwards, Julie is sent to the Grand Tides Hotel to deliver a dress to Madame Ricardo, an attractive young woman whose bills are paid by Lee's love-struck father, Mason Brooks. Having seen her husband, whom she believed to be in South America, on the grounds, Madame Ricardo deserts the hotel, so Julie dons the gown and masquerades as Mason's mistress. In the dining room, she meets Lee, who, hoping to interrupt his father's expensive affair, ardently woos "Madame Ricardo" and marries her. Mason, furious at Lee for "poaching on his father's preserves," rushes to the hotel. Meanwhile, Lee learns that Madame Ricardo already has a husband and deserts Julie, whom he still thinks is the madame. In the end, the mistaken identities are explained, and while Mason frees himself from the wiles of Madame Ricardo, Julie finds herself the happy wife of a rich man's son.