"Ever since Corey Fletcher found out that he's the world's first "throwback," with the power to not only visit history, but change it, he's been spending as much time in the past as possible. Corey loves using his skills to fix problems and help his friends and family. But as Corey becomes more and more addicted to rewriting history, he learns that time travel might change him in ways he may never be able to reverse. Aware now that he can't keep going...

In 1940 England, stuck in a train tunnel while German fighter jets fly overhead, Barney hears an unlikely story of a highly decorated World War I soldier who once had a chance to kill young Adolf Hitler.

Summer 1944. Max, Gerta, and their parents have abandoned their home and relocated to a safehouse in a different Berlin neighborhood. The Hoffmanns share the tight quarters with Kat Vogel, the daughter of an executed Becker Circle conspirator. Though they have strict orders to stay inside unless absolutely necessary, the three kids sneak out regularly, all while concocting a plan to keep the spirit of their resistance alive. They're going to burn...