Nie Qing Cheng is a half demon, except she doesn't know it herself. Or the fact that her mother's demon clan helped shape the Qing Dynasty and their control ended with Eight-Nation Alliance invading China. Her father had raised her as a human child after her mother died in the conflict. But when a scientist exposed her true form and a fellow half-demon vying for her love, she wonders if her human side can prevail and if her human lover will stand by her side to the end.
After a fateful mission two years ago that left eight Special Forces soldiers dead, newly promoted Naval Investigator Abbey Vaughn makes it her personal mission to find the man responsible: the infamous drug lord Reynaldo Benitez. When her investigation brings in former Elite team leader Lt. Sam Harrigan, she reluctantly partners with him in order to bring the savage cartel leader to justice.