Reviews provided by RottenTomatoes
New York Times:
Even in mammoth VistaVision, the old Hitchcock thriller-stuff has punch.
The film is uncharacteristically rigid and pious for Hitchcock; it feels more like a work of duty than conviction.
Starting slowly amid colourful but rather superfluous travelogue-style Moroccan footage, the film improves no end as it progresses.
While drawing the footage out a bit long, he still keeps suspense working at all times and gets strong performances from the two stars and other cast members.