The Road by Cormac McCarthy

This book, set in a post-apocalyptic (precise nature of the apocalypse never specified) wasteland, is one of the best things I've ever read by Cormac McCarthy. A father and his son prowl through the desolated landscape, looking for food, fuel, and other useful items, and avoiding the bad guys who cannibalize dead people. They gradually make their way to the ocean, mostly helped by luck. It's when their luck turns sour that they must discover who they are, what they believe in, and whether they're able to trust. The prose is clear and strong.