also late to the party but Metro 2033 by Dmitry Glukhovsky has gotta prob make the list. Dregs of humanity scraping out a life in the subway tunnels of the former glorious metro stations of Moscow. There's a map included, an explainer on their mushroom tea, all the various factions of humanity, black market trading sites... etc etc. A reluctant hero fails his way through the book til the end and there's, OF COURSE, a plot twist. It's all a bit on the nose, but fun and you can see how it ended up a popular video game. Come for the dark moody post apocalyptic monster action, stay for the directions on which subway lines you will navigate to get to a given destination.