Read: The Quiet Earth

Not quite a science fiction, but more of a human nature story on what happens if everyone else (or most people) in the world got wiped out.

The building up of the character foreboding the eventual outcome where he kills off his only other companion. 

The science is fairly inconsequential to the story, and the bizarre loop ending, reminiscent of Groundhog Day also doesn't quite make sense.

Interesting read with a fair bit of drama though.