Look, up on the shelf! It’s a western. It’s noir. It’s science fiction. It’s all three, blended together in Zack Parsons’ brilliant novel, Liminal States, and it’s super, man.
There are some novels that come along that just manage to push all one’s buttons. Liminal States was that for me. So I’ll warn you that this might be a little biased to those who like westerns, noir, and dystopian/apocalyptic fiction in their SF.
[Abandon your spire. It is coming...]