"Neverwhere" is a fantasy novel written by Neil Gaiman, first published in 1996. The story follows Richard Mayhew, an ordinary man who discovers a hidden world beneath London, known as London Below. After helping a mysterious girl named Door, he finds himself trapped in this strange realm, where he must navigate its dangers to return to his normal life. The novel explores themes of identity, belonging, and the contrast between the mundane and the fantastical. It features a variety of unique characters, including the villainous Mr. Croup and Mr. Vandemar, as well as allies like Hunter and The Marquis de Carabas.