Claude Massoulier is murdered while hunting at the same place as Julien Vercel, an estate agent who knew him and whose fingerprints are found on Massoulier's car. As the police discover that Marie-Christine Vercel, Julien's wife, was Massoulier's mistress, Julien is the prime suspect. But his secretary, Barbara Becker, while not quite convinced he is innocent, defends him and leads her private investigations.
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| Directing | François Truffaut | Director |
| Camera | Néstor Almendros | Director of Photography |
| Sound | Georges Delerue | Original Music Composer |
| Writing | François Truffaut | Screenplay |
| Art | Hilton McConnico | Production Design |
| Writing | Charles Williams | Novel |
| Production | François Truffaut | Producer |
| Editing | Martine Barraqué | Editor |
| Writing | Suzanne Schiffman | Screenplay |
| Writing | Jean Aurel | Screenplay |
| Art | Jacques Gaillard | Assistant Art Director |
| Sound | Jacques Maumont | Sound |
| Lighting | Jean-Claude Gasché | Electrician |
| Crew | Marie-Christine Malbert | Unit Publicist |
| Production | Roland Thénot | Production Coordinator |
| Directing | Suzanne Schiffman | Assistant Director |
| Camera | Jean-Yves Freess | Grip |
| Production | Jean-François Lentretien | Administration |
| Lighting | Philippe Darmon | Electrician |
| Production | Donatienne Desmarestz | Production Secretary |
| Production | Armand Barbault | Producer |
| Sound | Pierre Gamet | Sound |
| Lighting | Patrick Gasché | Electrician |
| Art | Jean-Michel Hugon | Assistant Art Director |
| Lighting | Patrick Lemaire | Electrician |
| Directing | Rosine Robiolle | Assistant Director |
| Camera | Tessa Racine | Assistant Camera |
| Costume & Make-Up | Michèle Cerf | Costume Design |
| Art | Franckie Diago | Assistant Art Director |
| Camera | Florent Bazin | First Assistant Camera |
| Visual Effects | Frédéric Moreau | Visual Effects |
| Camera | Gérard Bougeant | Grip |
| Directing | Christine Pellé | Script Supervisor |
| Production | Jacqueline Oblin | Administration |
| Art | Alain Gambin | Assistant Art Director |
| Editing | Colette Achouche | Assistant Editor |
| Sound | Bernard Chaumeil | Boom Operator |
| Costume & Make-Up | Thi-Loan Nguyen | Makeup Artist |
| Camera | Charlie Freess | Grip |
| Camera | Alain Venisse | Still Photographer |
| Costume & Make-Up | Christiane Marmande | Assistant Costume Designer |
| Editing | Marie-Aimée Debril | Assistant Editor |
| Production | Josiane Couëdel | Production Secretary |
| Costume & Make-Up | Chantal Durpoix | Hairstylist |
| Sound | Daniel Couteau | Sound Effects |
| Production | Jacques Vidal | Assistant Production Coordinator |
| Directing | Pascal Deux | Assistant Director |
| Costume & Make-Up | Thi-Loan Nguyen | Key Makeup Artist |
