Since the suicide of his wife, Jacques Loursat has gone downhill. Estranged from his daughter, his lawyer's pratice in ruins, he consoles himself with drink. One night he is woken by a gunshot and catches sight of a young man fleeing the house. Isabelle, his daughter, claims to know nothing about it, even when he finds the body of a young man. Isabelle hangs around with a gang of spoiled young people who have no shortage of money, and is in love with Joel, an ambitious boy involved in drug dealing. Antoine, from a more modest background, is in love with her. When the police start investigating Joel's murder, Antoine becomes the ideal suspect.
| Directing | Georges Lautner | Director |
| Writing | Bernard Stora | Writer |
| Writing | Jean Lartéguy | Writer |
| Writing | Georges Lautner | Writer |
| Writing | Georges Simenon | Novel |
| Production | Jean-Paul Belmondo | Producer |
| Production | Alain Sarde | Producer |
| Sound | Francis Lai | Music |
| Camera | Jean-Yves Le Mener | Director of Photography |
| Editing | Georges Klotz | Editor |
| Art | Sylvia Laquerbe | Production Design |
| Art | Denis Moutereau | Production Design |
| Art | Jean-Baptiste Poirot | Production Design |
| Art | Sylvie Salmon | Production Design |
| Costume & Make-Up | Paulette Breil | Costume Design |
| Sound | Christine Pansu | Sound Editor |
| Sound | Joël Riant | Sound |
| Sound | Anne Wasels | Sound Editor |
