It's possibly not the best time to be prescribing one of the most dispiriting books in the history of literature, but it is a truly exceptional novel for its language (perfect, austere), the love story (familial, not romantic; a father and son) and it's devastating account of life after an apocalypse. Devastating, it has been years since I read it but I can still feel how it changed me, and I can still feel it in my body. It also won a Pulitzer.
Picador 2007 (first published 2006).
Paperback in reasonable nick, tiny dog ears.