Killer Eyes--Antagonist

In the sequel to Killer of Killers, which has the working title Killer Eyes, the antagonist is a Chinese woman named Ming Sang, and she comes the closest of all the villains in my four books to being a sociopath. But she's really not. She knows the difference between right and wrong, and she does care about other people, but she's cold-hearted. Not cruel, but unrelenting in the pursuit of her own brand of justice. It has to do with the Chinese holocaust, which is something that most Americans know nothing, or very little about. It took place during WWII, like the Jewish holocaust, but in China and it was orchestrated by the Japanese military against Chinese civilians, mostly in the city of Nanking. By extension, it occurred throughout the Chinese countryside during the conquest and occupation of southeast China. The Japanese soldiers were particularly cruel to the Chinese, and the estimates of Chinese civilian casualties are in the millions. Ming Sang is the granddaughter of a Chinese resistance fighter who organized a death squad which hunts down and executes all Japanese ex-military men who were involved in that holocaust. Not unlike Jewish Nazi hunters. And my main character, Trent Smith was trained by a martial arts expert named Shoji Wada who is a veteran of the Japanese military, and he was there. At Nanking. But that's all I need to say at this point. Except for the obvious, that Ming Sang targets Shoji Wada for execution. But she does it her own way, and as a means for another end that has nothing to do with Nanking. Okay, that's all for now. I'm not even finished revising it yet.