A father and his young son journey on foot across a
post-apocalyptic, ash-covered United States, some years after an undefined
extinction event resulted in societal collapse and the extinction of almost all life on Earth. The boy's mother, who was pregnant with him at the time of the disaster, died by suicide at some point after his birth. Realizing they cannot survive the winter in northern latitudes, the father takes the boy south along county roads towards the sea, carrying their meager possessions in their knapsacks and a supermarket cart. The father is suffering from a cough. Throughout the novel, he assures his son that they are "good guys" who are "carrying the fire". The pair have a revolver but only two rounds. The father has tried to teach the boy to use the gun on himself, if necessary, to avoid falling into the hands of
cannibals. They attempt to evade a group of
marauders traveling along the road, but one marauder discovers them and seizes the boy. The father shoots the marauder dead, and they flee the marauder's companions, abandoning most of their possessions. Later, when searching a mansion for supplies, they discover a locked cellar containing people whom their captors have imprisoned to eat them limb by limb and flee into the woods. As they near starvation, the pair discovers a concealed bunker filled with food, clothes, and other supplies. They stay there for several days, regaining their strength, and then carry on, taking supplies with them in a cart. They encounter an older man with whom the boy insists they share food. Farther along the road, they evade a group whose members include pregnant women, and soon after, they discover an abandoned campsite with a newborn infant roasted on a spit. They soon run out of supplies and begin to starve before finding a house containing more food to carry in their cart, but the man's condition worsens. The pair reaches the sea, discovering a boat that has drifted from shore. The man swims to it and recovers supplies, including a
flare gun. While the boy sleeps on the beach, their cart and possessions are stolen. They pursue and confront the thief, a wretched man traveling alone. The father forces him to strip naked at gunpoint and takes his clothes together with the cart. This distresses the boy, so the father returns and leaves the man's clothes and shoes on the road, but the man has disappeared. As they are walking through a town inland, a man in a window shoots the father in the leg with an arrow. The father responds by shooting his
assailant with the flare gun. The pair moves farther south along the beach. The father's condition worsens, and after several days, he realizes he will soon die. The father tells the son he can talk to him after he is gone and that he must continue without him. After the father dies, the boy stays with his body for three days. The boy is approached by a man carrying a shotgun. The man tells the boy he and his wife have a son and daughter. He convinces the boy he is one of the "good guys" and takes the boy under his protection. ==Development==