Princess Diana’s tragic death would prompt a three-year investigation by Scotland Yard - but what crime had been committed… and who was really to blame? In the third episode of a new seven-part Beyond Reasonable Doubt podcast from Mail+, award-winning crime writer Stephen Wright speaks to the people who knew Princess Diana to unravel the conspiracy theories around her death - as a bombshell note from the Princess suggested that someone was plotting to kill her, and that person was, ‘My husband’.