Anna has long been engaged to Sandro, a promising albeit idle young architect. At this point, it seems that their relationship will never lead to marriage. She hides her despair as they go on vacation on a friend’s yacht around the Lipari islands, taking along Claudia, Anna’s less fortunate friend. But on Lisca Bianca, following an argument with Sandro, Anna disappears. All attempts at locating her fail. Sandro and Claudia decide to join strengths in order to find her, but soon their unsuccessful quest attracts them to one another irresistibly. Claudia finds in Sandro the love of her life, whereas he, very soon, betrays her. Even though her dream has been shattered, she forgives him.