A biography of Prince Philip, Duke of Edinburgh, to mark his 70th birthday. Heald, who first interviewed the Duke in 1969, has talked to those who have known him most intimately over the years - to Prince Bernhardt of the Netherlands, the Duke's sole surviving sister, Sophie, Commander Mike Parker, Admiral of the Fleet Lord Lewin, Sir Hugh Casson, the man who taught him to fly, to his rivals at polo and in carriage driving, to the two Deans of Windsor and to Sir Peter Parker. The picture that emerges is of a man in a hurry, still piloting himself in helicopters and other aircraft, still sending out a stream of letters to all those involved in his many interests and duties.