This story, filmed with sensuous detail and nuance, is set in Austria in the 1920s. While being treated for asthma at a country spa, an American diplomat's lonely 12-year-old son is befriended and infatuated by a suave, mysterious baron. But soon his adored friend heartlessly brushes him aside and turns his seductive attentions to his mother. The boy's jealousy and feelings of betrayal become uncontrollable.