Marina di Malombra (Borelli) lives in a castle prior to her wedding. She begins to read letters written by an ancestor called Cecilia. She finds out that Cecilia was driven to her death by her uncle. Marina identifies with Cecilia and take revenge on her behalf by murdering her uncle.
The daring Countess Blanche Alberti spends the film in hot pursuit of a spy posing as a count who stole her father’s secret documents-- after stealing her heart and betraying her.