1911: When fifteen-year-old Mary Kirk meets Wallis Warfield at summer camp, she’s immediately captivated by her fearless, brazen, and self-assured personality. And Wallis has a way with the boys who are drawn to her like moths to a flame. Though Mary’s family isn’t crazy about her new best friend, s...

1911: When fifteen-year-old Mary Kirk meets Wallis Warfield at summer camp, she’s immediately captivated by her fearless, brazen, and self-assured personality. And Wallis has a way with the boys who are drawn to her like moths to a flame. Though Mary’s family isn’t crazy about her new best friend, she steadfastly stands by her side—even years later when they’re adults and rumors swirl about Wallis and her reckless behavior with none other than the Prince of Wales. But when Mary’s loyalty to Wallis comes into question, their friendship will be put to the ultimate test.

1997: After a romantic proposal in Paris, Rachel and her fiancé Alex are in a cab when suddenly the car ahead crashes. They’re stunned to learn Princess Diana is in the car. By the wreckage, Alex finds a heart pendant with an engraved letter “J” and Roman numerals XVII and gives it to Rachel to hold. Haunted by the crash and Diana’s subsequent death, Rachel is intrigued when she discovers that Di had visited the last home of Wallis, the Duchess of Windsor, only hours before the accident. Eventually, the revelation of a long-forgotten link to Wallis Simpson leads Rachel to the truth behind a scandal that shook the world...