"Berlin, November 1943. The city is blanketed by explosions. Siblings Gerta and Max Hoffmann live a surprisingly carefree childhood amid the air raids. Berlin is a city going about its business, even as it's attacked almost nightly. But one night, the sirens wail, and the Hoffmanns' neighborhood is hit. A mortally wounded man comes to their door, begging to be let in. He asks for Karl, their father. Gerta and Max watch as Karl tries in vain to save...

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...