Somewhere in Europe, a scientific research institute, houses the lair of one of the leaders of a terrorist organization called The Black Hand. Zhan Raur, who is suffering from a delirium of power and also from a heart condition, awaits the visit of an unknown correspondent carrying precious documents. But the F.B.I. He has been replaced by one of his agents, Thomas Asher, who is responsible for unlocking the secrets and ramifications of The Black Hand.
| Actor | Role |
|---|---|
| JJames HarrisThomas Varaga | Thomas Varaga |
 Janine ReynaudMafalda | Mafalda |
| AAnny NelsenAlbane | Albane |
 Chantal NobelÉléonore | Éléonore |
 Jean TopartZanror | Zanror |
| PPierre TissotMember of the Black Hand | Member of the Black Hand |
| FFred MorganNot listed | Not listed |
| LLuigi CorteseHenchman | Henchman |
 Claude SalezMember of the Black Hand | Member of the Black Hand |
 Michel CharrelLlasan | Llasan |
 Alfred BaillouThe dwarf | The dwarf |
| JJacques DarsenNot listed | Not listed |
| AAlexandre MincerNot listed | Not listed |
| DDoris ThomasVivian Ray | Vivian Ray |
 Jean FranvalMechanic | Mechanic |
 Colette RégisHousekeeper | Housekeeper |
 Jacques BernardFerenzari | Ferenzari |
 Rico LópezHenchman | Henchman |
 Martine Brochard(uncredited) | (uncredited) |
| RRoger DodierNurse (uncredited) | Nurse (uncredited) |
| EElisabeth Maury(uncredited) | (uncredited) |