Scottish athlete Eric Liddle competed in the 1924 Olympics in Paris as a runner, but the most important thing in his life was his faith. A devout Christian, he was a missionary who worked as a teacher in China. In 1941, when Japanese aggression makes China a dangerous place, foreign nationals are told to leave. Liddle's wife and children go to Canada, but he stays on to work at a mission helping the poor. But when the Japanese invaded China, he is imprisoned in an internment camp where he and his fellow captives try to survive, and his faith gives him strength against those who try to break him.