Alfred Hitchcock	...	(Réalisateur)
John Michael Hayes, Charles Bennett	...	(Scénariste)
Alfred Hitchcock	...
James Stewart	...	Dr. Benjamin 'Ben' McKenna
Doris Day	...	Josephine Conway 'Jo' McKenna
Brenda De Banzie	...	Lucy Drayton (as Brenda de Banzie)
Bernard Miles	...	Edward Drayton
Ralph Truman	...	Inspector Buchanan
Daniel Gélin	...	Louis Bernard
Mogens Wieth	...	Ambassador
Alan Mowbray	...	Val Parnell
Hillary Brooke	...	Jan Peterson
Christopher Olsen	...	Henry 'Hank' McKenna
Reggie Nalder	...	Rien
Richard Wattis	...	Assistant Manager
Noel Willman	...	Woburn
Alix Talton	...	Helen Parnell
Yves Brainville	...	Police Inspector

Commentaires: A little knowledge can be a deadly thing!

Résumé: Dr. Ben McKenna, his wife Jo and their son Hank are on a touring holiday of Africa when they meet the mysterious Louis Bernard on a bus. The next day Bernard is murdered in the local marketplace, but before he dies he manages to reveal details of an assassination about to take place in London. Fearing that their plot will be revealed, the assassins kidnap Hank in order to keep the McKenna's silent. Ben and Jo go to London and take matters into their own hands.