"It's 1562 and Catholic Spain threatens the stability of Protestant England. In France, the Protestant Huguenots also face threats from the powerful Catholics. Fearing that such pro-Catholic movements might spread to England, Elizabeth hopes to mediate a peace between the two French factions.
The queen wants Ursula Blanchard to go to France, where civil war may break out at any moment, to hand-carry a letter from Elizabeth to France's queen mother and regent, Catherine de Médicis. To keep her mission secret, Ursula will ostensibly accompany her former father-in-law, Luke Blanchard, a man she neither likes nor trusts, when he travels to France to fetch his young ward, Helene, to the safety of England"