Literary luminaries Sir Harold Evans and Tina Brown, with their children, Isabel and George, boarded Queen Mary 2 yesterday, the world's grandest ocean liner, for a mid-season Transatlantic Crossing. Frequent Cunard guests, Brown will lecture on her New York Times bestseller, The Diana Chronicles, while Evans enjoys a much-deserved break from his critically acclaimed work on modern American innovators. Embarking in New York, they are welcomed by Captain Christopher Rynd.