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Its August 16th, 1943, the height of WWII. Nine-year-old Max Pietrowski, his little brother Paul, and their friend Susan are creating fantasy worlds in their secret hideout, the storage room of a Massachusetts factory. Meanwhile, German saboteur Heinrich Mueller sets the timer for bombs to destroy the building. The factory makes weapons for the US military.The children interrupt Heinrichs strike, delay his escape, and prevent his heros return to Germany. Although the devastating effects of that violent day haunt them, the kids keep the secret of how the factory exploded for nearly two drecades.In 1961, Heinrich grabs an opportunity to get revenge on the spoilers of his mission. Cloaked in the guise of a respected citizen, he commits atrocities against Max and his family until the only option Max can imagine to protect the people he loves is murder. But Susan encourages Max to beat Heinrich at his own game, resulting in an ending none of them anticipates.