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.
Grimani, enraged, has Casanova arrested and charged with witchcraft, but he escapes from prison and flees Venice - taking with him Jack, his young illegitimate son by a previous liaison, and Rocco, his servant.
Casanova heads for Paris, as he knows that Venetian ambassadors abroad are able to grant pardons.
