A gang of thieves are robbing luxury apartments in Rome, but after emptying the villa of the wealthy Mr. Douglas, the thieves are beginning to die.

Margherita nicknamed Fornarina is Raphael's mistress. Beatrice, a noblewoman who is also in love with the famous painter tries to get her out of the way, by having her wrongly accused of the murder of a loan shark, whom she has in reality killed herself. Fornarina is sentenced to death. Will Raphael manage to prove her innocent?