Follows investigators examining theories surrounding Princess Diana's death, including mysterious vehicles in the tunnel and allegations of powerful forces determined to silence her.

In August 1997, the tragic death of Diana, Princess of Wales, stunned her family and catapulted the British public into one of the most extraordinary weeks in modern history. What was it about Diana that resulted in such an outpouring of grief? And what does that week reveal about Britain's relationship with the monarchy, then and now?