Following the death of their mother, young brother and sister, Matteo and Valentina, remained intensely close. They become acquainted with Stefano. Valentina and Stefano almost seem to be made for each other, but, in the days that follow, the continuous fighting with her brother because of jealousy convinces her to break off with her new friend. But when Stefano begs to see her once again, she is forced to accept a final lunch date, during which her suitor's emotionally unstable character comes out in the open, to the point where he threatens her and her brother. Terribly upset, Valentina reports what has happened to Matteo, who agrees to run away with her..