August 1942. Jacob and Moses Stein, two young Jewish brothers, are staying with their aunt in Paris amid the Nazi occupation. The boys' parents, well-known German playwrights, have left the brothers in their aunt's care until they can find safe harbor for their family. But before the Steins can reunite, a great and terrifying roundup occurs. The French gendarmes, under Nazi order, arrest the boys and take them to the Vélodrome d'Hiver -- a massive, bleak structure in Paris where thousands of France's Jews are being forcibly detained.