At the age of nineteen, Yolande, daughter of the King of Aragon, is sent away from her family, her friends, and everything she knows, to marry the young Duke Louis II of Anjou, first cousin of the King of France. Their marriage has been arranged to bring an end to a generation of bitter conflict between Aragon and Anjou for possession of the kingdom of Naples and Sicily, an inheritance they both claim. Despite waiting nine years for her fiance to return to France from Naples, to Yolande's surprise their union becomes not only a great love story, but also sets in motion events which will change the course of history.

As Louis spends more time and money fighting for his distant kingdom, Yolande is left alone with their five children and, as her husband's regent, to govern their vast inheritance. With her wealth, her subtle intelligence, charm and the clever use of her spies, she becomes the saviour not only her own territories, but also of France. Her Royal Highness Princess Michael of Kent unveils this seldom told story, enriched by her insider's perspective of court life.

This is an epic, sweeping novel which vividly recounts the true story of England's invasion of France in the 15th century, a dramatic and enthralling period in the history of both countries, witnessed by the captivating and complex heroine, Yolande, known as The Queen of Four Kingdoms.