Daughter of the Duke of Milan and wife of the conniving Count Girolamo Riario, Caterina Sforza was the bravest warrior Renaissance Italy ever knew. She ruled her own lands, fought her own battles, and openly took lovers whenever she pleased. Her remarkable tale is told by her lady-in-waiting, Dea. Dea reviews Caterina's scandalous past and struggles to understand their joint destiny, while Caterina valiantly tries to fight off Cesare Borgia's unconquerable army.