| Cary Grant | Peter Joshua |
| Audrey Hepburn | Regina 'Reggie' Lampert |
| Walter Matthau | H. Bartholemew |
| James Coburn | Tex Panthollow |
| George Kennedy | Herman Scobie |
| Ned Glass | Leopold W. Gideon |
| Jacques Marin | Insp. Edouard Grandpierre |
| Paul Bonifas | Mr. Felix (stamp dealer) |
| Dominique Minot | Sylvie Gaudel |
| Thomas Chelimsky | Jean-Louis Gaudel |
A suave stranger helps a chic widow stalked by four men looking for loot in Paris.
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