In 'The Princess,' a documentary on Diana flips the focus

This image released by HBO Max shows promotional art for the film "The Princess," a documentary premiering on Aug. 13. (HBO Max via AP)

The last thing the world needs, you might think, is another Princess Diana documentary.

It's a fair thought considering that almost 25 years after her death, her life and impact is still media fodder. Whether it's a magazine cover or a book claiming to have new revelations or just an image of Kristen Stewart in a re-creation of her wedding dress for the movie "Spencer" or Elizabeth Debicki sporting the "revenge dress" for the series "The Crown," the culture continues to have an insatiable appetite for all things Diana.

And yet documentarian Ed Perkins managed to find a novel way in: by turning the lens back on us.

"The obvious truth is that Diana's story is one of the most told and retold stories probably in the past 30 years," Perkins said in an interview this week.