1942. Joseph Weisman is 11 years old. On the morning of June 6, he must go to school with a yellow star stitched to his chest. The new anti-Jewish decree of the French government has come into force. Like all Jews in France, Jo learns that he is banned from parks, cinemas, fairgrounds and public gardens. Despite this, Jo and his family lead a happy life in Paris, until dawn on July 16, when this happiness is shattered. At 4am they are awakened by shouts and banging on doors as men in black uniforms burst into apartments. Jo and his family are hauled out of their beds and herded onto buses by French gendarmes. 13,000 Jews are crammed into the Winter Velodrome in Paris. This is the biggest Round Up in history and perpetrated by collaborating French police. The imprisoned Jews endure five days without water, food or healthcare. Dr. Sheinbaum (Jean Reno) whom has been rounded up with all the others does what he can for the welfare of those around him. Annette Monod (Melanie Laurent), a protestant Red Cross nurse, is appalled by the racism of her country's government of collaborators and attempts to provide aid to the Jews as their ordeal continues.