Aurora Meredith is the daughter of the village blacksmith. Because she has a promising voice, her family does everything they can to develop her talent. A wealthy New York woman hears her sing and sends her to Europe to study. But the woman dies, and Aurora borrows money for her last year from a hot-blooded Italian man. Instead of being paid back financially, the Italian wants her love, and she rejects him.

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.

Four lifelong friends share one very special summer. They develop an enduring bond despite their distinctly different emerging personalities.