Castle Dux, Bohemia, 1798. Casanova, now a penniless librarian in his seventies, begins to tell his life story to Edith, a young kitchen maid in the castle he works in.

Casanova, living on his wits and as a mystic, does a good deed and comes into a fortune. Bragadin offers to adopt him and Henriette agrees to marry him.

In the past, we follow Casanova's adventures in London - where he glimpses Henriette and tricks his way into court circles - and in Naples, where he meets an old friend. Still living on his wits, Casanova makes and loses fortunes and also enjoys other conquests.