The director of the French Ministry of the Interior summons Serge Cazals, an Interpol agent, to unmask the leaders of an organization that sells military intelligence and has just made a name for itself with the assassination of Secret Service ace Georges Dandieu. Cazals is soon spotted by his adversaries and dangerously threatened. Through an intermediary in the organization, he obtains a telephone number that leads him to various leads, but to no avail. He then decides to set a trap, with the help of his friend Violaine.
| Actor | Role |
|---|---|
 Roger HaninSerge Cazais | Serge Cazais |
 Estella BlainViolaine | Violaine |
 Bernard Blierle Patron | le Patron |
 Michel Vitoldle colonel Eric Urenbach | le colonel Eric Urenbach |
 Lise Delamarela marquise de Caulaincourt | la marquise de Caulaincourt |
 Fabienne Dalila chanteuse | la chanteuse |
 Claude CervalNilpiker | Nilpiker |
 Yves BarsacqGino Servantes | Gino Servantes |
 Joël Papoufle fils du Patron | le fils du Patron |
 José Luis de VilallongaGeorges Dandieu | Georges Dandieu |
| JJean BarthetNot listed | Not listed |
 Geneviève ThénierNot listed | Not listed |
| RRoland MilletNot listed | Not listed |
 Gérard HoffmannNot listed | Not listed |
| Claude CervalNot listed | Not listed |
| JJacques BézardNot listed | Not listed |
| LLuc CharpentierNot listed | Not listed |
| DDaniele DenisNot listed | Not listed |