O'Hara, the widow of an English breeder, comes to the St. Louis Exposition looking for a rancher who will work with her on crossbreeding Herefords and longhorns. The man who agrees to her concept is a fiery Scotsman, Keith, who gives Stewart the job of transporting the Hereford bull to
Texas. Persistent O'Hara, along with her daughter Mills, demands to go along on the trip. Stewart, a cynical cowpoke, has accepted a bribe to swindle the lady. But in the course of protecting her from stampedes, rustlers, and other hazards of the West, he begins to admire O'Hara and her ideals.
When the bull is safely delivered, Keith begins to doubt the whole project, questioning wh...