A cracking premise - following a nuclear/biological war, possibly the only remaining human life on earth is isolated in the Moscow underground metro system, which had doubled as a massive bunker, each station operating as a more or less autonomous community, connected by a range of loose confederations (religious and/or political or pragmatic - including communists, trotskyists, a 'fourth reich', and many others), and troubled by a range of monsters, some created by fallout from the war and others seemingly with a more supernatural or spiritual/mystical origin. That concept is strong enough to make the book worth plowing through, despite the awkward prose, overwrought existential digressions, and frequent long-winded soliloquies about the meaning of existence that all of its characters seem to love.