Metro 2033 by Dmitri Glukhovsky
This novel is set in a post-apocalyptic Moscow, where the remnants of humanity have taken refuge in the underground metro system after a devastating nuclear war. The story follows Artyom, a young man who embarks on a perilous journey through the dark, mutant-infested tunnels of the metro to seek help against a new, mysterious threat that endangers the fragile existence of the metro's survivors. Along the way, he encounters various factions vying for power and control, confronts his deepest fears, and questions his beliefs and the nature of reality itself. The narrative weaves together themes of survival, hope, and the enduring human spirit in the face of overwhelming darkness.