In December of 1944, Lionel Evans, an internationally renowned American conductor, is on a USO tour with his 70-piece symphony orchestra in newly-liberated Belgium. While fleeing from a German counterattack, Evans and his orchestra members are captured by a Panzer division and taken to an old chateau in Luxembourg. Despite orders to execute every prisoner, General Schiller, an avid music lover, commands Evans to give a private concert for him.