Paris, France, 1942, during the Nazi occupation. Robert Klein, a successful art dealer who benefits from the misfortunes of those who are ruthlessly persecuted, discovers by chance that there is another Robert Klein, apparently a Jewish man; someone with whom he could be mistakenly identified, something dangerous in such harsh times.
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| Directing | Joseph Losey | Director |
| Production | Alain Delon | Producer |
| Production | Robert Kuperberg | Producer |
| Production | Ralph Baum | Executive Producer |
| Camera | Gerry Fisher | Director of Photography |
| Editing | Marie Castro | Editor |
| Editing | Henri Lanoë | Editor |
| Editing | Michèle Neny | Editor |
| Writing | Franco Solinas | Screenplay |
| Sound | Egisto Macchi | Original Music Composer |
| Sound | Pierre Porte | Original Music Composer |
| Sound | Georges Bacri | Music Producer |
| Sound | Georges Bacri | Music Editor |
| Crew | Frantz Salieri | Choreographer |
| Camera | Pierre-William Glenn | Camera Operator |
| Camera | Jean-Francis Gondre | Camera Operator |
| Camera | Richard Andry | Camera Operator |
| Camera | Victor Rodrigue | Still Photographer |
| Directing | Philippe Baronnet-Fruges | Assistant Director |
| Directing | Rémy Duchemin | Assistant Director |
| Directing | Philippe Monnier | Assistant Director |
| Directing | Lucie Lichtig | Script Supervisor |
| Writing | Fernando Morandi | Co-Writer |
| Writing | Costa-Gavras | Co-Writer |
| Sound | Federico Savina | Sound Mixer |
| Sound | Alex Pront | Sound Mixer |
| Production | Claude Levy | Researcher |
| Production | Margot Capelier | Casting |
| Production | Dominique Lallier | Casting |
| Production | Dominique Rigaux | General Manager |
| Production | Michèle Lalune | General Manager |
| Production | Gille Schneider | General Manager |
| Production | Simone Clement | Production Secretary |
| Costume & Make-Up | Michel Deruelle | Makeup Artist |
| Costume & Make-Up | Françoise Andrejka | Makeup Artist |
| Costume & Make-Up | Pierre Vadé | Hairstylist |
| Crew | Georges Laconelli | Special Effects |
| Camera | René Strasser | Key Grip |
| Art | Alexandre Trauner | Art Direction |
| Art | Gérard James | Set Decoration |
| Art | Pierre Charron | Set Decoration |
| Production | Ludmilla Goulian | Production Manager |
| Art | Pierre Duquesne | Set Designer |
| Art | Olivier Girard | Set Designer |
| Sound | Egisto Macchi | Conductor |
| Sound | Pierre Porte | Conductor |
| Production | Christine Brierre | Publicist |
| Production | Jérôme Brière | Publicist |
| Production | Nicole Cateux | Administration |
| Crew | Raymond Danon | Presenter |
| Crew | Alain Delon | Presenter |
| Crew | Robert Kuperberg | Presenter |
| Crew | Jean-Pierre Labrande | Presenter |
| Production | Jean Bolvary | Producer |
| Production | Sergio Bonotti | Producer |
| Production | Raymond Danon | Producer |
| Production | Roland Girard | Producer |
| Production | Norbert Saada | Producer |
| Costume & Make-Up | Colette Baudot | Costume Design |
| Costume & Make-Up | Annalisa Nasalli-Rocca | Costume Design |
| Art | Henri Berger | Props |
| Art | Michel Suné | Props |
| Sound | Maurice Dagonneau | Sound |
| Sound | Jean Labussière | Sound |
| Lighting | Charles Lefèvre | Electrician |
