Neverwhere

"Neverwhere" is a urban fantasy novel by Neil Gaiman, first published in 1996. It follows Richard Mayhew, an ordinary man who helps a mysterious girl named Door and is then thrust into London Below, a fantastical, underground world populated by strange characters and creatures. As he navigates this dark and perilous place, Richard must confront various challenges to return to his former life. The story explores themes of heroism, identity, and the unseen lives that exist alongside our own. "Neverwhere" is renowned for its imaginative world-building and rich storytelling, blending the mundane with the extraordinary.