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| James Stewart | Dr. Ben McKenna |
| Doris Day | Jo McKenna |
| Brenda de Banzie | Lucy Drayton |
| Bernard Miles | Edward Drayton |
| Ralph Truman | Buchanan |
| Daniel Gélin | Louis Bernard |
| Mogens Wieth | Ambassador |
| Alan Mowbray | Val Parnell |
| Hillary Brooke | Jan Peterson |
| Christopher Olsen | Hank McKenna |
| Reggie Nalder | The assassin |
| Richard Wattis | Assistant manager |
| Noel Willman | Woburn |
| Alix Talton | Helen Parnell |
| Yves Brainville | Police inspector |
| Carolyn Jones | Cindy Fontaine |
| Patrick Aherne | Handyman (uncredited) |
| Betty Baskcomb | Edna (uncredited) |
| Leo Gordon | Chauffeur (uncredited) |
| Louis Mercier | French policeman (uncredited) |
| Anthony Warde | (uncredited) |
| Gladys Holland |
Plotters kidnap a U.S. couple's son to hide an assassination at Royal Albert Hall.
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