Shadow by Chris George

Ellis Graves has found his way into the strange city-world of Shadow, where he has become entangled in the dark plans of blue-blooded Philosophers and savage monsters. His only allies are a beautiful pirate without a vessel and an old man who just might be completely mad.

All he wants to do is find a way back home, but it seems that's a goal ten thousand years in the making, and it's just what his enemies are hoping for...