The Roman taxi driver Pietro Marchetti finds himself to witness a mafia crime. Having to testify at the trial, he is checked by the police, especially when he has to go to the United States to attend the graduation of his son Francesco.

Venice, sixteenth century. Giulio, a foreign gentleman spends a memorable night in the city where he meets and beds two beautiful women. They are Angela, a widowed lady, and Valeria, whose husband has left for Florence.