Cerasella, a lively young woman, is about to marry the mild mannered and timid Alfredo, but escapes shortly before the wedding. She hides on a motor boat where she meets Bruno, a rich young man who is in love with Nora, a shallow girl. When Cerasella is found by her brother, she declares that she doesn't want to marry Alfredo because she doesn't love him. Meanwhile Bruno's father, being sure that Nora doesn't love his son, disagrees to their wedding. When he sees that Bruno has no intention to stop his wedding plans, he disowns him. Nora immediately leaves him for this reason and Bruno is forced to search for work. Cerasella offers him work in her father's firm, on the condition that he pretends to be her fiancée. They soon fall in love with each other in reality. Bruno's father changes his mind and finally grants permission for his son to marry Nora, who does her best to reconquer her ex-fiancée. To reach her goal, she does not hesitate to slander Cerasella. Bruno believes her, leaves his work and returns to Nora. After a conversation of Cerasella and Bruno's father, he discovers Nora's dishonesty and manipulation. He convinces his son to abandon the frivolous girl and to marry Cerasella.