Less a definitive potential spoiler, more a "too much to hope for" scenario?
"A post-apocalyptic tale, in which a lone man fights his way across America in order to protect a sacred book that holds the secrets to saving humankind." - http://www.imdb.com/title/tt1037705/
Argument: The Hughes Brothers simply don't make enough films.
Counter-argument: Quality, not quantity, old chap.
Counter-counter-argument: Yes, but From Hell was a bit of a mess and, at times, sucked rats' cocks.
Put it this way, in a post-nuclear holocaust scenario, with society all screwed up, I know which book I'd be desperate to get my hands on:
(Cheers to Edward Bayntun for the film poster.)