The guardians of Venetian morality burst into the apartments of notorious libertine Giacomo Casanova. He is indicted for atheism, possession of indecent literature, and fornication - the last a hard charge to shake off, as he happens to be in bed with an equally naked woman. As his friend Senator Bragadin tries to intercede for him, the imprisoned Casanova is tormented both by evil jailer Lorenzo and by memories of his lost love, the innocent country girl Cristina, whom he betrayed.
—Peter Brynmor Roberts