Grace Kelly’s ‘wild child’ daughter, Princess Stéphanie of Monaco, once ran away with the circus after falling for an elephant trainer

Called the "colorful child" of the House of Grimaldi by the documentary's narrator, Angela Rippon, the princess was only 17 when she and her mother's car plunged off of the side of a 100-foot cliff in Monaco in 1982. Hugo Vickers, a royal biographer interviewed in the documentary said Kelly "may have had a small stroke," which could explain why she suddenly lost control of the car.

Kelly died after the crash, and the documentary explores whether the "chaotic nature" of Stéphanie's later love life is rooted in the trauma.