Two women, divided by time, bound by a secret. 1911. Aged just fifteen, Mary Kirk and Wallis Warfield meet at summer camp. Their friendship will survive heartbreaks, continents, and the demands of the English crown, until it is shattered by one unforgivable betrayal... 1997. Kendall's romantic break in Paris with her fiance is interrupted when the taxi in front crashes suddenly. The news soon follows: Princess Diana is dead. Trying to forget what she has witnessed, Kendall returns home, where the discovery of a long-forgotten link to Wallis Simpson, the Duchess of Windsor, will lead her to the truth of a scandal which shook the world.