Two police inspectors track down a mysterious criminal who signs his crimes with a fiery triangle. When they have just discovered an accomplice, one of the police officers, in love with the young girl, is shot dead. His colleague will then have only one goal in mind.
| Actor | Role |
|---|---|
 Jean AngeloL'inspecteur Brémont | L'inspecteur Brémont |
 André RoanneL'inspecteur Charlet | L'inspecteur Charlet |
 Elisabeth PinajeffVéra | Véra |
 Renée HéribelIrène | Irène |
 Paul OllivierMaltère | Maltère |
 Maurice RémyNot listed | Not listed |
| MMarcel MerminodNot listed | Not listed |
| FFrançoise CourvoisierNot listed | Not listed |
| GGrouhisNot listed | Not listed |
| RRené MontisNot listed | Not listed |
| AAndré Saint-GermainNot listed | Not listed |
| GGaudinatNot listed | Not listed |
| CClaude MartinNot listed | Not listed |
| LLilly RezillotNot listed | Not listed |
| MMarc-HélyNot listed | Not listed |