[1] The plot and characters are exactly the same as in the series, with the exception that the novel form allowed Gaiman to expand and elaborate on certain elements of the story and restore changes made in the televised version from his original plans.

This breaks, however, when he stops to help a mysterious young girl who appears before him, bleeding and weakened, as he walks with his fiancée to dinner to meet her influential boss.

Going to the Market, a giant bazaar where people barter for all manner of junk and magical items, Richard realises that London Below is not such a bad place.

The legendary bodyguard and fighter Hunter joins Richard, Door and the Marquis and the party set out for the Earl's Court.

When the four reach the Earl's Court, on a mysterious underground train which follows its own bizarre schedule, the Marquis is forced to leave.

After some searching they find the Angelus, which Door "opens" using her family's Talent, and travel through it to the underground home of the angel.

Islington explains that its position as protector of London Below is a punishment for the submersion of Atlantis, which had also been also under its care, and tells Door that it will help her learn the identity of those who killed her family, for a price.

In the meantime, the Marquis seeks out Croup and Vandemar, exchanging a priceless Tang dynasty figurine for information regarding who ordered the murder of Door's family.

The true price for this information, however, is his life; Croup and Vandemar capture, torture, and kill him, breaking the one-hour "head start" agreement that was part of their deal with the Marquis.

On Down Street, it is discovered that Lamia was a dangerous choice for a guide, because the price she demands of Richard for her services is higher than he can pay and yet live, but the Marquis appears in time to save him.

He draws the shape of a door with his knife (a dying gift from Hunter), but nothing happens so he despairs of returning and is feeling that he has ruined his life, but in the end the Marquis appears to provide a way back.

Gaiman hinted at a novella-length sequel in the commentary section of his short story collection Fragile Things, published in 2009.

The story was published in the 2014 anthology Rogues, edited by George R. R. Martin and is also now included as a coda to current printings and the audiobook of Neverwhere.

[3] In February 2017, whilst promoting his newest book, Norse Mythology in London, Gaiman confirmed to applause from the audience that he was three chapters into writing The Seven Sisters.