Charade was actually directed by Stanley Donen although I'm sure he was very much inspired by or channelling Alfred Hitchcock's classic thrillers. That said I just adore Charade; it's one of my favourite Audrey Hepburn films. It would actually have been very interesting if Hitchcock had made a film with Audrey Hepburn. Apart from her lack of blonde hair I think she would have fit the Hitchcock heroine archetype very well. Ausrey was always pure class and beauty and didn't possess an overt sex appeal that Hitchcock seemed to have a distaste for.