William & Catherine: A Royal Romance" chronicles the love story of Prince William (Dan Amboyer) and Kate Middleton (Alice St. Clair) that resulted in one of the most celebrated weddings in history. At a pivotal point in their courtship, William takes to heart the advice of his mother, the late Princess Diana (Lesley Harcourt), which she bestowed in an interview before her untimely death. The message she left for her son: hold on to the love of your life and protect it with all of your heart.