The marriage of a wealthy and frivolous member of French nobility, Loyette Merval, to an American aristocratic idler named Willard Standish, is a loving one, except for their mutual dissatisfaction with Willard's idleness. After Willard becomes a chauffeur, Loyette's subsequent disgust causes him to quit. When the war begins, Willard joins the French Secret Service, while Loyette continues her social life, upset about their separation. After Willard, wounded, hides in a convent, Loyette leaves to find him. As the Germans approach, the nuns escape. Finding Willard alone, Loyette, disguised as a nun, hides him in the altar. Although ordered to be shot, Loyette's air of innocence saves her. When she overhears a plot to have the Allies chase the Germans over a mined hill, Loyette kills the soldier on watch. Although she and Willard are captured and killed, they meet crossing the River Styx and embrace as they sail to eternity.