Live in Infamy by Caroline Richmond (WW2 #3)
It has been eighty years since the Axis won World War II, and America was divided between the victors: the Nazis in the East and Imperial Japan in the West; but now resistance is growing in the Eastern territories and sixteen-year-old Chinese American Ren Cabot, who has every reason to hate the Japanese who executed his mother, finds himself drawn into a resistance group and confronted with choices that could lead to freedom–or death.