Neverwhere

This is probably one of Neil Gaiman's greatest works outside of Sandman.  Neverwhere is very similar to another story by Gaiman, Stardust.  The difference is that in Stardust Tristran Thorn embraces that word that he has ventured into where Richard Mayhew can't wait to get home to London above.  It is only when he returns to London above that he realizes everything he could have ever wanted was beneath his feet in London below.  The story is your basic group quest adventure in which Richard Mayhew is kind of just tagging along for the ride until he meets the black friars & goes through the ordeal.  Telling anymore would spoil the story for those who are not already familiar with the tale.  I really wish Gaiman would follow up this story in some way preferably with more books.  It seems that this is just a taste of what awaits in London below.  If anything this makes me want to pick up more of Neil Gaiman's prose work.