Neil Gaiman -
Neverwhere An early book from the author of American Gods.
From the back cover:
Richard Mayhew is a plain man with a good heart - and an ordinary life that is changed forever on a day he stops to help a girl he finds bleeding on a London sidewalk. From that monent forward he is propelled into a world he never dreamed existed - a dark subculture flourishing in abandoned subway stations and sewer tunnels below the city - a world far stranger and more dangerous than the only one he has ever known...
Dark, funny, immersive, insightful. About the people who have "fallen through the cracks".
