Charles is a doughboy in France; for him, war is another opportunity to sing in a quartet. He falls for Antoinette, a local bar maid. She likes him too. She encourages him to study, so he does and becomes a sergeant. But, his love life and musical career are interrupted by shooting, trench warfare, and Charlie's continual run-ins with a cranky lieutenant. A crisis befalls Charlie when the quartet's tenor is shot in the throat: Charlie hears a German soldier singing like an angel, so he hatches an elaborate plan to bring the soldier across no man's land. Can Charlie pull all of it off, including winning Antoinette's hand?