Michael O'More, an American who lives in Ireland with his uncle, a horsetrainer for the Earl of Balkerry, loves Lady Mary Cardigan, granddaughter of the Earl. He finds a rival in Capt. Brian Fitzroy, a rake who intends to buy the impoverished earl's castle and marry Lady Mary. After nearly killing Fitzroy in a brawl over Lady Mary, Michael flees to the United States. There he becomes financially secure when department store magnate Abe Feinberg offers him a job. Feinberg commissions Michael to establish a linen mill on the earl's estate. He and Mary, who is in the United States evading Fitzroy, return to Ireland and marry.