This was a scifi post-apoc full of unexpected twists. It came off as a little heavy-handed at some points, but overall it was a fantastic read. The Earth has been invaded by an alien race who are only killing humans that threaten them or use technology. They are also leveling the human cities. Humans have been thrown into the stone ages without tech, electricity, running water, etc. The biggest threat, however, in the collapsing society isn't the aliens - it's other humans.
This appears to be a perma-free on Amazon, so I recommend you go ahead and give it a try for yourself. It's a novella. I'm not sure if this is setting up for a series, but the story does stand on its own and has made me interested in checking out the author's other books.