Virginia Oldoini, Countess of Castiglione, is an unscrupulous and beautiful woman, in love with Andrea Pieri, a patriot ready to do anything to free Italy from the foreign oppressor. Wounded during a chase, Pieri takes refuge in the castle of Virginia, which, with the approval of her husband, Count Francesco Verasis of Castiglione, takes care of him. Meanwhile, Nigra, in charge of the affairs of the Kingdom of Piedmont in Paris, discovers the relations of the countess with the subversives and sees in her the perfect tool to bring Napoleon closer to the Italian cause.