The plot revolved around Richard Mayhew, a Scot living in London, who encountered an injured girl, Door, on the street one night. Despite his fiancée's protests he decided to help Door. Once he entered Door's realm, however, he wss almost instantly and completely forgotten in London Above, become noticable only to the denizens of 'London Below', whose inhabitants generally pass unseen to the people of 'London Above'. HIs apartment was re-rented while he was still - un-noticably - living in it, his job went to another, and he found to get his old life back, he had to submerge himself in Door's, even as she was hunted by hired assassins.
In London Below the various familiar names of London all took on a new significance: Knightsbridge becomes "Night's Bridge", a stone bridge steeped in impenetrable darkness which took its toll in human life; the Angel, Islington, an actual angel, and Blackfriars, actual monks.
The episodes were released in the US and Canada on DVD on 9 September 2005Gaiman adapted the series into a novel, which was released in September 1996. It was accompanied by a audio book release. The text was later re-written for the US market and a third version is now available which combined elements of both earlier versions of the novel.
A nine-issue comic book limited series began in June 2005, written by Mike Carey , with art by Glenn Fabry. Vertigo changed a character, the Marquis De Carabas, who had been portrayed in the TV series and on the radio as a man from the African Diaspora, into a black skinned creature not seen in the real world. The comic was an adaptation inspired by the novelization, rather than the original TV series. The series was published by DC Comics's Vertigo imprint. The collected volume was also published by Vertigo, in February 2007 (ISBN 1-4012-1007-4).