Late in the 10th century, the Liao dynasty is at the zenith of its power. The omnipotent Liao rule much of what is now Northeast China, Mongolia, Russia, and much of the Korean Peninsula. Prime Minister Xiao Si Wen and Princess Yan have three daughters, with the youngest, Xiao Chao, their favourite. Her heart belongs to the aspiring military commander, Han De Rang, whose family have served the Liao loyally for decades.