Set during the Civil War in a small upstate New York village, the story centers around Abner Beech, a stubborn and fiercely independent farmer who staunchly opposes the war and President Lincoln's policies. Labeling himself a "Copperhead," a term used for Northerners who sympathized with the South, Abner's vocal dissent places him at odds with his neighbors, many of whom are fervent Union supporters. His opposing views lead to heated conflicts with the community, testing the limits of friendship and tolerance. Complicating matters further is the relationship between Abner’s son, Jeff, and Esther Hagadorn, the daughter of a Unionist zealot, which creates additional tension.

As the town becomes increasingly divided, the animosity towards Abner boils over into acts of violence and social ostracism. The strained relationships and mounting hostilities reflect the broader national schism, showcasing the personal cost of political convictions. In this turbulent environment, individuals must navigate conflicting loyalties and moral dilemmas, grappling with the ramifications of their beliefs and actions.