The novel follows the rise and fall of Charles III, Duke of Bourbon, who held the prestigious position of Constable of France. Born into a noble family, Charles initially enjoys a prosperous and honorable career, earning respect and favor in the French court due to his military prowess and loyalty to the crown. However, a series of political and personal conflicts begin to unravel his fortunes.The turning point in Charles's life comes when he falls out of favor with King Francis I of France, largely due to disputes over the inheritance of his estates and the influence of powerful rivals at court. Feeling betrayed and humiliated, Charles ultimately decides to switch allegiances, offering his services to the Holy Roman Emperor, Charles V. This act of defiance marks a dramatic shift in his life, leading to his infamous role in the Sack of Rome in 1527, one of the most notorious events of the Renaissance.Ainsworth's narrative explores the complex character of Charles, portraying him as a man torn between his sense of honor and his desire for revenge. The novel delves into his internal struggles, the consequences of his decisions, and the tragic trajectory of his life as he moves from a position of power and respect to one of disgrace and infamy.