An American businessman visiting Lisbon gets mistaken for a British secret agent who stole some diamonds. As a result, he has everybody in Lisbon after him.
| Actor | Role |
|---|---|
 James GarnerWilliam Beddoes | William Beddoes |
 Melina MercouriAurora / Celeste da Costa | Aurora / Celeste da Costa |
 Sandra DeeAmy Franklin | Amy Franklin |
 Anthony FranciosaSteve / Antonio | Steve / Antonio |
 Robert CooteHatton / Jones | Hatton / Jones |
 Roland CulverDoctor Mathieson | Doctor Mathieson |
 Grégoire AslanFlorian | Florian |
 Cecil ParkerSir Huntley Frazier | Sir Huntley Frazier |
 Dulcie GrayMrs. Mathieson | Mrs. Mathieson |
 Martin BensonPolitanu | Politanu |
 Peter IllingZarik | Zarik |
 Niall MacGinnisShip's Captain | Ship's Captain |
 Virgílio TeixeiraInspector Rodrigues | Inspector Rodrigues |