Don't worry, there isn't a man in an iron mask in a cave off the coast of England somewhere that looks like Prince William. There was however another member of the royal family who bore his name and caused quite the stir back in the 60s with his playboy lifestyle. This programme documents the romance between Prince William of Gloucester and glamorous divorcee, model and former air hostess Zsuzsi Starkloff, which ended with the former's tragic death in a plane crash in 1972 at the age of just 30. William was the Queen's cousin and pageboy at her wedding to Prince Philip in 1947, at which time he was fourth in line to the throne. However, his forbidden romance caused consternation at Buckingham Palace, and Starkloff speaks on camera for the first time about their relationship, which began when he was stationed at the British Embassy in Tokyo in 1968.