Resistance Women by Jennifer Chiaverini

 This is an incredible story featuring women belonging to the Rote Kapelle, a group resisting Nazism in the years leading up to World War 2. The book focuses on Intellectuals, some with pro-communism sympathies, who passed on information about the Nazi military buildup and intentions to the outside world, eventually sending significant information to the Soviet Union about Hitler's intention to invade. This is historical fiction at its very best because the women, only one of whom is fictional come across as developed characters that engage the reader while the historical events provide a context that is both gripping and horrific.