Dolores Hart had it all. Billed as "the next Grace Kelly" for her beauty and acting talent, she had a seven-figure studio contract, roles opposite some of the industry's biggest names and was the envy of girls everywhere for giving Elvis Presley his first on-screen kiss. During a break 1963, aged 24, she told her bosses at MGM she was heading to see friends in the country. They sent a limousine to drop her off at the Abbey of Regina Laudis, in Bethlehem, Connecticut. It turned out to be a one-way journey. Next Sunday, nearly half a century after she...