In 19th century Italy, Tullio (Giancarlo Giannini), an insatiable aristocrat, grows bored with his timid wife Giuliana (Laura Antonelli) and neglects her for his more exciting mistress, the wealthy widow Countess Teresa Raffo (Jennifer O'Neill). After learning that Giuliana is having a torrid affair of her own, he becomes tormented by her infidelity and descends into madness.