A revenge-driven man named Bart Allison arrives in the town of Sundown with his companion Sam. They come here seeking Tate Kimbrough, a powerful and manipulative man who is about to marry Lucy Summerton, the respected local doctor's daughter. Bart holds a personal grudge against Tate, blaming him for the death of his wife, and he's obsessed with confronting and killing him to avenge her. The entire town is under Tate's control, and as Bart and Sam enter the town, they are met with hostility and suspicion by the townspeople and Kimbrough's henchmen.

The wedding day becomes tense as Bart disrupts the ceremony, resulting in the town being locked down in a standoff. As Bart draws closer to his quarry, he starts to learn more about the history between his late wife and Tate, and the complexities of their past connection begin to surface. This information challenges Bart's understanding of the situation and forces him to question his long-held motivations. Meanwhile, the people of Sundown, who are normally submissive to Tate's rule, begin to show signs of unrest and the prospect of change in their community as the presence of an outsider challenges the status quo.