For years now, Chief inspector Gustave Picard has been trying to bring down Salviati, the dreadful leader of a drug-selling gang. Lucienne Préville, an informer who works for him, has infiltrated the gang but her position is dangerous. On the other hand, Scoppa, Salviati's former right-hand man, has started challenging his former boss. Will Salviati, the brutal public enemy, clear off at last?
| Directing | Michel Bernheim | Director |
| Directing | Christian Chamborant | Director |
| Writing | Henri La Barthe | Story |
| Production | Claude Dolbert | Producer |
| Sound | Jane Bos | Original Music Composer |
| Camera | Jean Isnard | Director of Photography |
| Art | Jean-André d'Eaubonne | Production Design |
| Art | Raymond Gabutti | Production Design |
| Directing | Charlotte Lefèvre | Assistant Director |