A Russian spy is assigned to steal sensitive information from NATO about military mobilisation. Without much intelligence of his own, the distrusted Soviet intelligence agent needs all the help he can get from his 'talented' partner Penelope Lightfeather as they scatter around the French countryside for secret rendezvous while trying to avoid being caught by counterintelligence agents and distrustful communist operatives.
| Actor | Role |
|---|---|
 Brigitte BardotPenelope 'Penny' Lightfeather | Penelope 'Penny' Lightfeather |
 Anthony PerkinsHarry Compton / Nicolas Sergueivitch Miloukine | Harry Compton / Nicolas Sergueivitch Miloukine |
 Grégoire AslanBagda | Bagda |
 Jean-Marc TennbergInspector Cartwright | Inspector Cartwright |
 Hans VernerDonald Farrington | Donald Farrington |
 André LuguetSir Reginald Dumfrey | Sir Reginald Dumfrey |
 Hélène DieudonnéMamie | Mamie |
 Jacques MonodSurgeon - the chauffeur | Surgeon - the chauffeur |
 Denise ProvenceLady Barbara Dumfrey | Lady Barbara Dumfrey |
 Charles MillotFedor Alexandrovitch Balaniev | Fedor Alexandrovitch Balaniev |
 Paul DemangeBank director | Bank director |
 Jacques HillingLe Lord-Admiral | Le Lord-Admiral |
| FFrederica LayneMaud Smith (as Fredrika Layne) | Maud Smith (as Fredrika Layne) |
| AAnnick AllièresEléonore - la serveuse du Lion's | Eléonore - la serveuse du Lion's |
| DDominique PageRosemary | Rosemary |
 Robert MurzeauClément | Clément |
 Jacques DynamLe sergent de police | Le sergent de police |