Robert Leaf (James Stewart) is an American college professor whose precocious son Erasmus (Bill Mumy) is a mathematical prodigy. After using his skills for gambling at the racetrack, it is discovered that Erasmus is infatuated with Model (person) and actress Brigitte Bardot. He writes love letters to her, and she invites him to visit her in France. Prof. Leaf accompanies him on the journey. Prof. Leaf later uses his son's talent to raise funds for liberal arts scholarships. He is assisted by Peregrine Upjohn (John Williams (actor)), who is secretly a Confidence trick who plans to abscond with the funds.<ref name=Tomatoes></ref>