Another Awesome novel by Gaiman! Richard Mayhew leads a boring negligible life, pushed around at work and by his fiance named Jessica. Then, though he and Jessica are running late for a critical dinner, he stops to help a bleeding unconscious street urchin, named Door, a resident of DownBelowLondon. His involvement with this underworlder leads him to slip through the cracks and become invisible/nonexistent to the in the London Above world. He returns to London Below , seeks out the girl Door, and persuades her to let him accompany her on her search for her parents’ killers.
Gaiman excels at worldbuilding and tangible atmosphere. There is a steam-punk feel to this novel, though it was published in 2003, well before the steampunk craze.
I just love this author.