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 |
| Writing | François Truffaut | Screenplay |
| Sound | Georges Delerue | Original Music Composer |
| Camera | Néstor Almendros | Director of Photography |
| Writing | Charles Williams | Novel |
| Writing | Suzanne Schiffman | Screenplay |
| Writing | Jean Aurel | Screenplay |
| Production | François Truffaut | Producer |
| Editing | Martine Barraqué | Editor |
| Art | Hilton McConnico | Production Design |
| Costume & Make-Up | Thi-Loan Nguyen | Key Makeup Artist |
| Production | Armand Barbault | Producer |
| Costume & Make-Up | Michèle Cerf | Costume Design |
| Costume & Make-Up | Chantal Durpoix | Hairstylist |
| Costume & Make-Up | Thi-Loan Nguyen | Makeup Artist |
| Directing | Pascal Deux | Assistant Director |
| Directing | Rosine Robiolle | Assistant Director |
| Directing | Suzanne Schiffman | Assistant Director |
| Art | Franckie Diago | Assistant Art Director |
| Art | Jacques Gaillard | Assistant Art Director |
| Art | Alain Gambin | Assistant Art Director |
| Art | Jean-Michel Hugon | Assistant Art Director |
| Sound | Bernard Chaumeil | Boom Operator |
| Sound | Daniel Couteau | Sound Effects |
| Sound | Pierre Gamet | Sound |
| Sound | Jacques Maumont | Sound |
| Visual Effects | Frédéric Moreau | Visual Effects |
| Camera | Florent Bazin | First Assistant Camera |
| Camera | Gérard Bougeant | Grip |
| Lighting | Philippe Darmon | Electrician |
| Camera | Charlie Freess | Grip |
| Camera | Jean-Yves Freess | Grip |
| Lighting | Jean-Claude Gasché | Electrician |
| Lighting | Patrick Gasché | Electrician |
| Lighting | Patrick Lemaire | Electrician |
| Camera | Tessa Racine | Assistant Camera |
| Camera | Alain Venisse | Still Photographer |
| Costume & Make-Up | Christiane Marmande | Assistant Costume Designer |
| Editing | Colette Achouche | Assistant Editor |
| Editing | Marie-Aimée Debril | Assistant Editor |
| Directing | Christine Pellé | Script Supervisor |
| Production | Josiane Couëdel | Production Secretary |
| Production | Donatienne Desmarestz | Production Secretary |
| Production | Jean-François Lentretien | Administration |
| Crew | Marie-Christine Malbert | Unit Publicist |
| Production | Jacqueline Oblin | Administration |
| Production | Roland Thénot | Production Coordinator |
| Production | Jacques Vidal | Assistant Production Coordinator |
