For 63 years, she kept her “madly in love” affair with John F. Kennedy a buried secret — until now. Suddenly, he was at her table, asking to sit next to her, then personally inviting her to an event the following week. “Give me your seat, so a tired old man can sit next to a pretty girl,” de Vegh recalled JFK telling her date at the event, initiating the pair’s first, seemingly innocent meeting. The future 35th US president and his coed conquest would sleep together on and off for the next four years. No matter, the rising star...