In Nazi-ruled Germany, Joe St. George is forced to watch as the country is divided around him by fear and hate. Joe thinks he and his family are safe, but when his father disappears one night, everything changes. Suddenly Joe and his mother are suspects of the state, but for what, Joe has no idea. They plan their escape from Germany, even though it means leaving Joe's father behind. However, Joe and his mom are separated before they make it out, and he is forced to go on without her.

Eventually Joe arrives in London but quickly realizes he's not free of the Nazis. Since Joe's escape, Hitler has been marching west, and London is under constant attack from the skies. Desperate to find his parents, Joe begins to dig into what happened back home. But the truth is a lot more complicated and dangerous than Joe ever imagined, and soon he is recruited by MI5 and given a deadly mission that will put him in the very center of Hitler's ruthless reign. From vital convoys across the frozen North Atlantic, to the terror of the Blitz, to the shadowy world of the French Resistance, just how far will Joe have to go to save his family ... and himself?