Captain James Wingate, Warner Baxter, a British army officer, is disgraced when he takes the blame for his cousin Henry's misappropriation of the regiment's charitable fund. He is loved by Henry's wife, Lady Diana Kerhill, Eleanor Boardman, who knows his innocence and Henry's guilt. To save their marriage and their honor, they decide James must leave the country. He heads to the Wild West, taking over a ranch in Montana.
In the rugged Montana frontier, a local bootlegger named Cash Hawkins, Charles Bickford, sets his sights on James's land as a smuggling route from Mexico and tries to bend Naturich, Lupe Vélez, to his will. James steps in to protect Naturich, earning her gratitude and the spark of something deeper between them. When Cash Hawkins openly comes to kill him, James does not resist, his thoughts fixated on a picture of Lady Diana and the sense that death would be preferable. Naturich acts first, shooting Cash dead.
The sheriff Bud Hardy, DeWitt Jennings, and his associates back Cash and oppose James, yet they cannot pin Cash's supposed murder on him; Naturich remains unseen and untroubled by the law. She follows James home and saves him from two of Cash's men who manage to wound him; in gratitude, James welcomes her to stay. The two grow closer, marry, and welcome a son, Hal, Dickie Moore.
Years pass. Henry, now unfaithful to Diana, dies in a hunting accident and, in his final moments, confesses the theft. Sir John Applegate, Roland Young, arrives at the ranch with Diana for Hal's fifth birthday. The boy delights in a model railroad scene the hands have built, while his mother toils over a handmade wooden horse—the simple wonders that captivate a child’s imagination.
James longs to return to England, but his fidelity to Naturich remains steadfast, and he introduces her as his wife to the assembled guests. Sir John persuades James to let him take Hal back to England so the boy can be educated and prepared to inherit the earldom. Naturich retreats to the hills to pray as Hal is prepared for departure, while the sheriff and his men close in—having tracked Naturich to the roots of the case and now convinced she was the killer.
Naturich manages to slip back in time to bid Hal farewell as he leaves with Sir John. James confronts the sheriff on the front steps, and the tension peaks when Naturich returns to reveal the truth she cannot bear to live with—the realization of her own role in Cash’s death. She shoots herself, cradling the wooden horse she crafted for Hal. The room fills with the sound of the gunshot as everyone rushes in, and Naturich dies in James's arms, leaving a memory of love, sacrifice, and a life lived between two worlds.
