Death is a Ruby Light

Penelope St John-Orsini, NSA's crack double agent, is sent on a secret mission across the Russian steppes into the desolate wastes of Eastern Siberia. Her objective: to track and destroy a Red Chinese scientist who has invented a formidable laser death ray.
Masquerading as Mongolians, Penelope and her team of professionals have to face hostile Tartar warriors, and the savagery of the Kinghan mountains before they reach the shores of the mighty River of the Black Dragon — the threshold to Red China, and the second round in the game of death.