I think I could find The Graveyard Book's vibes in Neverwhere.

This book about Richard Mayhew who live in London (above) then meet a bleeding girl named Door, then he went to London Below.

Richard met Marquis, Assasins, Angel and other creatures in London Below, that eventually makes him thinking over about what is he really want in his life.

This one is page turning and nice to listen in audiobook. I enjoyed read this book, world building was very impressive, but the characters are not my favorite.