On the road to greatness, one young woman must make an unthinkable choice.

For Princess Mary, life has never been simple, but through it all the love of her father, the Duke of York, has been a constant and reliable comfort. Despite his own loyalty to the Catholic Church, the Duke and his brother, King Charles II, raised Mary as a Protestant to protect her in a time of religious and political upheaval. In order to cement this safety and to ensure the stability of the family line, at age fifteen, Mary is married to her Protestant first cousin William, Prince of Orange.

However, in post-Restoration England, matters are rarely so simply settled. When Marys uncle, King Charles II, dies suddenly and without an heir, her beloved father is crowned James II. But a Catholic king is not the will of the people, and even Marys own husband is crying out for change. Can Mary take part in actions that will ultimately remove her own father from the throne and endanger his life? With family loyalty and the will of a nation at odds, what choice can a young princess make?

With emotional clarity and vivid historical detail, beloved author Jean Plaidy brings us into the court and behind the scenes as history unfoldsand the young princess and her groom become William and Marythe legendary monarchs, and the only co-regents in the history of a nation.