Wherever Diana, Princess of Wales (security code name "Purple Five Two") went, in public or private, she was shadowed by her Scotland Yard personal protection officer, Inspector Ken Wharfe, whose job it was it keep her safe. In public Diana was greeted by adoring crowds. In private she craved anonymity, and it was Ken Wharfe’s brief to keep her away from prying eyes. The SAS-trained officer from the Yard’s elite Special Operations 14, Royalty and Diplomatic Protection Department, was with the Princess every step of the way. In private when they traveled, they often posed as man and wife under assumed names, "Mr. and Mrs. Hargreaves," to throw the determined paparazzi off the scent. When she wanted a private holiday Ken would be dispatched in secret to find the idyllic spot. In the six years that Ken was at Diana’s side they traveled hundreds of thousands of miles together, sharing secrets, laughter, and tears on a truly extraordinary journey. This is his exclusive story.