The young and handsome Duke of Barenlock is twenty-seven and is being constantly pestered by his mother and his family to get married. They are not only frightened he will not produce an heir to the Dukedom, but the Castle, one of the most famous in Scotland, is in desperate need of repair. The Duke‘s cousin Moira introduces him to an attractive American girl, Mary-Lee, who is an immensely rich heiress.