Disclaimer: I haven't read the original Neverwhere so I can't compare.
Neverwhere is a comic about a normal guy, with a normal, boring life, that by chance meets Door, a girl trying to escape from two killers who have assassinated her family and are searching for her, and that is able to open doors between the "normal" world and other in which other rules are at play. Their life will never be the same again as they try to find who and why is trying to kill Door, gathering some help.
A curious reading, the drawing is ok, the story has some twists and (quite some) violence, but in general it didn't "clicked" on me enough to feel it was a pleasure reading. I'll be passing it to some friend because is not a comic I'll go back anytime soon.