In the summer of 1953, Margaret Johnson, the wife of an American businessman, is touring Italy with her daughter, Clara. While sightseeing, Clara—a beautiful, surprisingly childish young woman—loses her hat in a sudden gust. As if guided by an unseen hand, the hat lands at the feet of Fabrizio Naccarelli, a handsome Florentine, who returns it to Clara. This brief episode, charged with coincidence and fate, sparks an immediate and intense romance between Clara and Fabrizio. Margaret, extremely protective of her daughter, attempts to keep Clara and Fabrizio apart.

"I know what the sunlight can be... The Light, the Light in the Piazza... tiny, sweet... And then it grows... And then it fills the air...."