[Suzerain of Sheol]

I actually came into this thread, sat there for a good 5 minutes wracking my brain, then came up with all of nothing. I just don't read much, if any, SF (assuming you draw a line between it and fantasy).

My favorite post-apocalyptic novel of the few I've read is The Protector's War/Dies the Fire, in which a mysterious event makes the chemical reaction that produces electricity no longer function, reducing the world to a medieval tech level.

I could recommend Bakker's Second Apocalypse series, but that's way more creepy dark philosophical fantasy than what you're looking for.

Or you can read through our RP. :p