Neverwhere (novel)

"Neverwhere" is a book about a man named Richard who lives in London. One day, he helps a girl named Door and gets pulled into a magical world called London Below. In this world, there are creatures like rats and monsters, and people who have special abilities. Richard helps Door find out who killed her family and why. Along the way, they meet many interesting characters and go on exciting adventures. Think of it like a big adventure playground with magic and mystery around every corner.