The Earl of Dunhaven, who disinherited his son for marrying an American, tries, on his deathbed, to leave his estate to his nephew, the Honorable Guy Wyndham. To stop him, the Dunhaven solicitor, John Grahame, travels to America and finds the earl's grandson, Jim Dunn, a Wyoming cowpuncher. Because Jim wants a home for his motherless nephew Sam, they go to England with Grahame, taking papers which prove, because the earl has since died, that Jim is his legitimate heir. Jim's Western ways irritate his newly-found, chilly relatives. Finding himself more at home with the servants, he teaches them American customs and songs, thus shocking his aunt, Lady Caroline Croxton. After falling in love with Lady Croxton's secretary, Phyllis Barton, who warns him about a plot to rid him of his inheritance, Jim establishes his right, but tires of British life, and leaves for America with Phyllis and Sam, after renting the estate to his relatives.