From the driver's seat of her convertible, New York heiress Nancy Crocker Fleming offers ditchdigger Anthony "Tony" J. Anthony $1,000 to marry her. Without asking any questions, Tony accepts the offer, but insists that all he needs is $793, and a few minutes later, he and Nancy are married by a justice of the peace. Nancy then abandons Tony on a street corner and speeds away with his dog, Mike. Determined to retrieve Mike, Tony tracks Nancy to her exclusive residence, unaware that she has married him in order to satisfy a condition of her father's will, which stipulates that she must marry an ordinary American to assure her inheritance. Nancy, who over the objections of her uncle, H. E. Crocker, wants to marry the fortune-hunting Count Georgi, tries to dismiss the ditchdigger, but he forces her to take him to the kennel where she has left Mike. After one of Nancy's friends sees Tony shove the heiress into his car, Tony is accused of kidnapping and is stopped by the police. At the police station, Nancy's marriage to Tony is revealed, as is her scheme to divorce him in Reno so that she and Georgi can marry and keep her father's fortune. When a newspaper reporter refers to Tony as a "Cinderella Man," however, the prideful Tony announces that he will be the one to file for divorce, not Nancy. As assurance that he will reach Reno first, Tony kidnaps Nancy again and, in spite of her loud protests, locks her in his trailer and drives toward Reno. At a gas station, Nancy, dressed in Tony's suit, slips away and takes a ride with two men. When the men discover Nancy's true sex, they attempt to assault her but are soundly routed by Tony. Impressed by Tony's bravura, Nancy warms toward her captor, but is disturbed by an accounting sheet on which Tony has written the name Caroline. After Tony refuses to explain his relationship to Caroline, Georgi, who has been following the couple in his chauffeur-driven car, arrives at their campsite. Jealous over reports that Tony has a wife in Chicago, whom she assumes is Caroline, Nancy returns to Georgi's side and plots with him to steal Tony's license plates and report him to the police. Tony, however, overhears their scheming and takes off during the night. Once in Reno, Tony is cleared of all bigamy suspicion and hires a lawyer to help him contest Nancy's divorce proceedings. At the divorce trial, however, Nancy's uncle rushes in and declares that the marriage has been annulled. After learning that Caroline is the name of the sailboat that Tony has been paying for in installments, Nancy plots to have a preacher marry them in earnest on the road back to New York.