She wasn't a great beauty, nor was she noted for her intellect. But when Kathleen "Kick" Kennedy - the fourth child of Joseph P. Kennedy, the U.S. ambassador to Great Britain, and his wife, Rose - arrived in London in 1938, she caused an unlikely sensation. In the new biography Kick Kennedy, author Barbara Leaming reveals fresh insight into the Kennedy daughter who died in a plane crash in 1948, just four years after her eldest brother, Joe Jr., was killed in a top-secret mission during World War II. Kick, Leaming writes, was "actually quite plain in appearance. Her hair was a shade of 'mousy brown,...