The Road by C. McCarthy
In a burned-out America, a father and his young son walk under a darkened sky, heading slowly for the coast. They have no idea what, if anything, awaits them there. The landscape is destroyed, nothing moves save the ash on the wind and cruel, lawless men stalk the roadside, lying in wait. Attempting to survive in this brave new world, the young boy and his protector have nothing but a pistol to defend themselves. They must keep walking.