This is a direct continuation of the novel “Main Refuge”. The action takes place a few days after its end. The story tells about the misadventures of the main character in the world of the post-nuclear Moscow metro, during the outbreak of the war for the Circle Line. The main character, left without friends, tries to survive and find his place in the underground world. On his way, the guy meets different people - good and evil, normal and not so normal, making sure that kindness and friendship are very rare in this underground world... The world of the novel has nothing to do with the world of "Metro-2033" by Dmitry Glukhovsky.