City Of Bones

Charisat is a city at the Fringe of the Waste, a rocky and treacherous area of desolation formed more than a thousand years ago when a mysterious holocaust drained the sea and destroyed the flourishing civilization of the Ancients. It is a city which survives by trade, and its most valuable merchandise is relics, artifacts from the remains of the Ancient city that once occupied Charisat's present location. Relics are priceless, and in a city where living space is at a premium and water is a scarce and valuable commodity, they are dangerous to own.
Khat, a member of a humanoid race created by the Ancients to survive in the Waste, and Sagai, his human partner, are relic dealers working on the edge of society, trying to stay one step ahead of the Trade Inspectors and to support Sagai's family. When Khat is hired to find relics believed to be part of one of the Ancients' arcane engines, they are both reluctant to become involved. But the request comes from the Warders, powerful mages who serve Charisat's Elector. Khat soon discovers that the deadly politics of Charisat's upper tiers aren't the only danger. The relics the Warders want are the key to an Ancient magic of unknown power, and, as all the inhabitants of Charisat know, no one understands the Ancients' magic.
A beautiful woman and a handsome thief will try to unravel the mysteries of an age-old technology to stop a fanatical cult before they unleash an evil that will topple Charisat, a place where silken courtesans and beggars weave lies side by side, and where the tier that you live on determines how high up the food chain you are.