Margo Richter describes herself as an award-winning mobile app developer trapped in a 16-year-old girl’s body. As a Margo-centric teenager, she is laser-focussed on her own ambitious goals and her own busy life. A junior stuck in a freshman world history class, she is not the least bit interested in what is happening with those around her, much less those who lived hundreds or thousands of years ago. Why should she be? Her future is bright! This is Margo’s mindset before she is reluctantly thrown into the lives of a blind slave from Georgia, a Jewish boy in Nazi Germany, a Romanian orphan, a Native American girl, a teen in Manhattan on 9/11, a Syrian refugee, a Wisconsinite during the Great Depression, a young Spartan soldier in ancient Greece and many others. A seemingly simple assignment given by her world history teacher may significantly complicate her Margo-centric plan.