Sharper Than A Serpent's Tooth

Description for SHARPER THAN A SERPENT'S TOOTH by Simon R Green:

My name is John Taylor. I'm a PI for hire in the Nightside, the dark and corrupt city within the city of London. Where the sun never shines and where pleasure and horror are always on sale--for the right price.

Not a nice place to visit or a nice place to live. So you wouldn't think I would care that it was about to be destroyed, by none other than my very own long-missing, not-quite-human mom.

But I do. I was born here, I live here, and I got friends here. They might not all be acceptable in polite company, but they're my friends, nonetheless.

I know that I'm the only one who can stop her. The trick is, how to do it without fulfilling this prophecy that says whatever action I take, not only is the Nightside doomed, but the rest of the world will soon follow...

This is #6 in A Novel Of The Nightside.