The Scarlet Plague - Jack London

A different side to the author of White Fang.  A post-apocalypse book in the vein of Ridley Walker, it takes place a few decades after the complete collapse of industrial society.  A mix of memories of the narrator and glimpses of what life has become after the collapse.  A strongly socialist book, with the rich elites exploiting the lower classes, who are of course the survivors after the fall.  Politics is clear but as a book it is a bit simplistic - there is not a lot of depth to the story.