When Katherine of Aragon is brought to the Tudor court as a young bride, the oldest princess, Margaret, takes her measure. With one look, each knows the other for a rival, an ally, a pawn, destined --- with Margaret’s younger sister, Mary --- to a sisterhood unique in all the world. The three sisters will become the queens of England, Scotland and France. United by family loyalties and affections, they find themselves set against each other. As they experience betrayals, dangers, loss and passion, the three queens find that the only constant in their perilous lives is their special bond, more powerful than any man, even a king.