Richard Mayhew, a Scot living in London, encounters an injured girl named Door on the street one night. Despite his fiancée's protests he decides to help her; upon doing so he ceases to exist on Earth and becomes real only to the denizens of 'London Below', whose inhabitants are generally invisible and non-existent to the people of 'London Above'. He loses his house, his job and nearly his mind as he travels London Below in an attempt to make sense out of it all, find a way back, and help Door survive as she is hunted down by hired assassins.

In London Below the various familiar names of London all take on a new significance: for example Knightsbridge becomes "Night's Bridge", a stone bridge whose darkness takes its toll in human life; The Angel, Islington is an actual angel. London Below is a parallel world in and beneath the sewers. Its inhabitants are the homeless, but also people from other times, such as Roman legionaries and medieval monks, as well as fictional and fantastical characters.  

źródło opisu: http://en.wikipedia.org/wiki/Neverwhere
źródło okładki: http://en.wikipedia.org/wiki/Neverwhere