The Bamboo Prison (1954)

Corporal Brady (Brian Keith) an American soldier captured during the Korean War, is taken to a POW camp. There he meets Sergeant Rand (Robert Francis) a prisoner who is cooperating with the North Koreans. Brady is disgusted by these actions, but he soon discovers that Rand is actually an intelligence officer playing along to access important secrets. Rand also becomes close to Tanya Clanton (Dianne Foster), the wife of an American traitor, in order to exact information.