Although Polis do not agree to intervene, a faction known as the Brahmins (who consist of scientists and academics who collect books from the library above), contact Artyom. They offer a solution to the threat of the Dark Ones in exchange for Artyom's help in recovering a sacred book, as they believe him to be psychically sensitive. Artyom travels to the surface with Melnik and young Brahmin called Daniel. They enter the library and are attacked by the 'librarians', mutated creatures that reside there. Daniel is mortally wounded, but before dying, gives Artyom his reward anyway. It is an envelope containing directions to a functioning missile silo. Artyom and Melnik flee without the book and re-enter the metro, arriving at station Kievskaya. Melnik leaves Artyom at the station while he goes to collect reinforcements but whilst he is away, Artyom becomes involved in the search for a missing child, Oleg. Artyom and Oleg's father are abducted by a tribe of cannibals who worship 'The Great Worm' while following the trail left by the child. They are rescued by Melnik and a squad of fighters and they escape into Metro-2, a secret set of tunnels that lead to the missile site.