Who is Anton Haliakov, who has just been abducted by the M.I.5 in London? A Soviet scientist apparently. But sixteen years before the man had another identity, Clément Tibère, and another nationality, French. So what led him to become Russian and to change identity? And why are the British secret services interested in him?
| Actor | Role |
|---|---|
 Lino VenturaClément Tibère | Clément Tibère |
 Leo GennChief of M.I.5 | Chief of M.I.5 |
 Suzanne FlonJeanne | Jeanne |
 Robert HardyAssistant | Assistant |
 Lea MassariMaria | Maria |
 Roger CrouzetAgent of the D.S.T. | Agent of the D.S.T. |
 Lucienne LegrandBookseller | Bookseller |
 Bernard DhéranM.Chat | M.Chat |
 Pierre ColletMechanic | Mechanic |
 André FalconPolice Commissioner | Police Commissioner |
 Richard MarnerNot listed | Not listed |
 Robert PartyKiller | Killer |
 Michel FortinTrucker | Trucker |
 Pierre ForgetNot listed | Not listed |
 George PravdaNot listed | Not listed |
 Pierre ZimmerMaria's new husband | Maria's new husband |
| JJerry BrouerNot listed | Not listed |
| RRichard Saint-BrisNot listed | Not listed |
 Max FournelNot listed | Not listed |
 Jeffry WickhamNot listed | Not listed |
 Bill PertweePolice Driver (uncredited) | Police Driver (uncredited) |