During World War II, the Japanese army occupied a prisoner of war camp on the Myanmar border. Due to strategic needs, the Japanese army would build a bridge on the border between Myanmar and Thailand, and hoped that prisoners of war in the prison camp would contribute, but Colonel Nikson (Alec Guinness), the British prisoner of war representative, believed that this violated the Geneva Conventions and refused to implement them. So Nikson and others were imprisoned, but without Nikson's leadership, the prisoners of war behaved negatively, and due to shortcomings in Japanese design, the bridge construction work stalled. The Japanese army had no choice but to release Nikson and others. After their release, Nikson felt that he should not do some construction in the war that destroyed everything, so he began to devote himself to building bridges. At the same time, the escaped American prisoner Shields (William Holden) accepts a special mission from the Allies to blow up the bridge on the day it is completed.