In a bleak, post-apocalyptic world, a father and his young son struggle to survive as they journey south on a desolate road. The landscape is barren, and food and supplies are scarce. They scavenge for whatever they can find, always on guard against the constant threat of lawless bands of cannibals who roam the land. The father, driven by love for his son and an intense determination to protect him, teaches the boy survival skills and imparts wisdom about moral choices. They carry a revolver with two bullets, reserved for the direst of situations, and keep moving in hopes of finding a safer place.

Throughout their journey, they encounter various challenges and fleeting moments of human connection that test their resolve and humanity. Flashbacks reveal the father's memories of his wife and the life they once had, adding emotional depth to their plight. Battling starvation, cold, and the ever-present danger from other survivors, the father’s health begins to deteriorate. Their relationship deepens as they face harrowing trials together, showcasing the bond between father and son in their quest for survival amidst a decaying world.