Queen of France at 16 and widow only 18, Maria Stuart does not give in to the pressure of those who would like a new marriage for her and go back to Scotland, her native land, to claim the legitimate right to the throne. Scotland and England, however, are under the rule of the mighty Elizabeth I. The two young queens are observed, each with a mixture of fear and admiration towards the “sister”. Rivals in politics and love, and regents in a world dominated by men, the two women will have to decide how to play the match that contrasts marriage and independence. Firmly determined to govern and not to be a mere representative figure, Mary claims for herself the throne of England, threatening the sovereignty of Elizabeth. Betrayals, rebellions and conspiracies shake both courts, jeopardizing the thrones and changing the course of history.