The narrative begins in the shadows of an evening angelus, where six nobles gather in a remote goat-herd's hut to plot against the reckless rule of Duke Gian Maria Sforza of Babbiano. Among them is Francesco del Falco, the Count of Aquila, a renowned and fiercely independent condottiero who is invited to usurp the throne. Rejecting the crown because of his loyalty to family ties and his absolute love for freedom, Francesco instead rides to the capital to counsel his cousin, only to find deaf ears and impending disaster from the expanding dominion of Caesar Borgia. Meanwhile, the proud and spirited Monna Valentina, niece to Guidobaldo of Urbino, flees an arranged marriage with the detested Gian Maria, seeking refuge in the seemingly impregnable fortress of Roccaleone.
Accompanied by the foppish Romeo Gonzaga and a band of mercenaries, she resolves to hold the castle against all comers. Francesco, drawn by memories of a brief and transformative encounter with Valentina during her journey from the convent, follows her to the fortress. He assumes the role of provost, instilling discipline into a disorganized garrison and thwarting the political and amorous designs of Gonzaga. As Gian Maria and Guidobaldo encircle the stronghold with cannon and men-at-arms, the unfolding drama transforms from a simple political rebellion into a passionate defense of personal autonomy. The narrative builds toward a confrontation where military strategy, hidden identities, and deep emotional stakes collide, ultimately questioning the true cost of power and the nature of genuine devotion.
