From the back cover of Avon book 315: Was she witch-woman or just the metal emperor's slave-girl?
Hidden in the heart of unknown Asia, a fantastic world of living metal waited. Monsters of solid metal, pulsating with an unearthly electric life, wise with wisdom not of this world, and dreaming of the day when its harder-than-steel horde, mountains high, could roll forth smashing and killing and flattening the world of mere humans.
Holding back this monster army was the figure of a woman - Norhala. Seemingly human, beautiful beyond comparison, with all the fickleness and tenderness of a young virgin, yet possessed of powers beyond science's conception. Norhala was the key to these horrors - and the four Americans who blundered into her domain unintentionally started a chain of events that would bring to a climax this danger to the world.
In addition to its stand-alone volume, this title was published in the follow books. It can be rated independently of any volumes containing it.