not a perfect metaphor

I'm not really into the fandom as such, and try to avoid writing fic on the grounds that plenty of people already do. But occasionally there are ideas that just don't shut up.
London Below is from a bloody awesome Neil Gaiman book called Neverwhere (apparently the miniseries thing came first, but I still haven't seen that), and part of the deal with it is people there have usually 'fallen through the cracks' of reality. So... yeah.
And sure, friend it away!