Sophia Alexander, the beautiful daughter of a famous surgeon in Berlin, has had to grow up faster than most young women. When her mother falls ill, Sophia must take charge of her younger sister, Theresa, and look after her father and the household, while also volunteering at his hospital after school. Meanwhile, Hitler's rise to power and the violence in her very own town have Sophia concerned, but only her mother is willing to share her fears openly....

As the United States enters World War II, seventeen-year-old Eleanor wants to do something to help her Jewish relatives in Poland, so she puts her brilliant math skills to work for the US army to fine-tune a top-secret weapon that will help defeat the enemy.

"1918: As the Great War rages, Jessie Carson takes a leave of absence from the New York Public Library to work for the American Committee for Devastated France. Founded by millionaire Anne Morgan, this group of international women help rebuild devastated French communities just miles from the front. Upon arrival, Jessie strives to establish something that the French have never seen-children's libraries. She turns ambulances into bookmobiles and trains...

The CNN host and best-selling author explores the revolutions--past and present--that define the polarized and unstable age in which we live.