Sir James Gilbert, a British peer, wagers that he can win the love of a particular young American woman for whom he has his heart set. Disguised as a chauffeur, James shows his love to Mary Burgess, niece of his wealthy employer, John Burgess. To obtain the consent of Mary's aunt, the couple involves her in a harmless trick. A villain threatens blackmail and attempts to pass himself off as the Sir James Gilbert. After a variety of adventures, the blackmailer's schemes are defeated. The young woman's hitherto hostile relatives are surprised and pleased when, instead of a chauffeur, Mary becomes the bride of Sir Gilbert.