Via Something Weird: "Four men representing the world’s great criminal organizations unite to locate a cache of sunken treasure. The treasure is in fact a fortune in diamonds and secret documents that was lost by the Germans in the seas off Monte Carlo during the war. Following their every move are representatives from every secret agency in the world, amongst them, the British, the Russians, the Germans, and the Americans, all seeking the important papers contained within the treasure."
| Actor | Role |
|---|---|
| GGérard BuhrLudwig Hermann | Ludwig Hermann |
 Françoise ArnoulLucie Antonini | Lucie Antonini |
 Petula ClarkPetula Clark | Petula Clark |
 Pierre MondyRobert Antonini | Robert Antonini |
 Marcel DalioJean Gregor / Gregor Veloni | Jean Gregor / Gregor Veloni |
 René HavardBobby | Bobby |
 Daniel IvernelCommissioner Mattei | Commissioner Mattei |
 Jacques MonodLucien Leonetti | Lucien Leonetti |
 Jean MarchatRobert's lawyer | Robert's lawyer |
 François MaistreDoctor | Doctor |
| MMercedes MolinerSandra | Sandra |
| RRick CooperAmerican | American |
 Yves BarsacqFernand | Fernand |
| MMonique MaréeNot listed | Not listed |
 Richard BigotiniAccused | Accused |
| LLuc CharpentierNot listed | Not listed |
| JJean-Jacques SteenInspector | Inspector |
| RRaoul Saint-YvesBartender | Bartender |
| CChristine OscarNot listed | Not listed |
| AAurelien LintermansNot listed | Not listed |