When the mission is too big to handle, they call Mountbatten. When the risk is too great, they call Mountbatten. When their own intelligence service is stretched too thin, they call Mountbatten. When they need to keep their hands clean and have complete deniability, they call Mountbatten. The Intelligence Community believes that Mountbatten-formerly known as Percival-is the only freelance operative to call when the mission needs to be done right the...