The Marquise Eugenia di Maqueda, an orphan raised by the nuns, marries Raimondo Corrao, but on their wedding night she finds out that he is her brother. The piece of news is in a letter written from Paris by their father, a womaniser who lives and hides from them in the French headtown. The pair decide, to avoid the scandal, to live as brother and sister. He will later leave for the war in Lybia, she will find solace and sexual satisfaction in the arms of the family chauffeur.
| Directing | Luigi Comencini | Director |
| Art | Dante Ferretti | Production Design |
| Production | Pio Angeletti | Producer |
| Editing | Nino Baragli | Editor |
| Art | Osvaldo Desideri | Set Decoration |
| Costume & Make-Up | Renata Magnanti | Hairstylist |
| Editing | Gino Bartolini | Assistant Editor |
| Directing | Grazia Baldanello | Script Supervisor |
| Camera | Tonino Delli Colli | Director of Photography |
| Production | Mario D'Alessio | Production Manager |
| Camera | Carlo Tafani | Camera Operator |
| Costume & Make-Up | Goffredo Rocchetti | Makeup Artist |
| Costume & Make-Up | Dante Ferretti | Costume Design |
| Production | Adriano De Micheli | Producer |
| Sound | Gianfranco Plenizio | Conductor |
| Writing | Luigi Comencini | Writer |
| Writing | Ivo Perilli | Writer |
| Sound | Fiorenzo Carpi | Original Music Composer |
| Costume & Make-Up | Paola Comencini | Assistant Costume Designer |
| Sound | Vittorio Massi | Sound |
| Production | Antonio Sarno | Unit Manager |
| Production | Roberto Mezzaroma | Accountant |
| Production | Stefano Bolzoni | Production Secretary |
| Camera | Paul Ronald | Still Photographer |
| Camera | Giancarlo Granatelli | Assistant Camera |
| Costume & Make-Up | Gilberto Provenghi | Assistant Makeup Artist |
| Costume & Make-Up | Silvana Senzacqua | Assistant Hairstylist |
| Directing | Massimo Patrizi | First Assistant Director |