Nicolas Pappas and Léon Dubois, two particularly calamitous killers, arrive in Paris, where a gangster boss in need of "staff", Jo Laguerre, hires them to cover the escape of the perpetrators of a hold-up. They get away with it as best they can and then find themselves in charge of liquidating a certain "Magnum"...
| Actor | Role |
|---|---|
 Bernard BlierNicolas Pappas | Nicolas Pappas |
 Jean LefebvreLéon Dubois | Léon Dubois |
 Gastone MoschinJo Laguerre | Jo Laguerre |
 Francis BlancheLa Prudence | La Prudence |
 Marc LawrenceMagnum | Magnum |
 Corinne MarchandValérie | Valérie |
 Michel SerraultThe armorer | The armorer |
| CCarlo CioccolantiNot listed | Not listed |
| JJacques BertrandRaoul Bertrand | Raoul Bertrand |
 Sébastien FlocheThe man with the dog | The man with the dog |
 André BadinLaguerre's henchman | Laguerre's henchman |
 Fernand BersetMagnum's henchman | Magnum's henchman |
 Katia ChristineNot listed | Not listed |
| BBernard FaurePrudence's student | Prudence's student |
| FFrancesco RosanoNot listed | Not listed |
 Marcel GassoukA member of the order service (uncredited) | A member of the order service (uncredited) |