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New York Times:
Alfred Hitchcock's famous talent for brewing a mood of fine suspense with clever direction and cutting is spent on a nigh suspenseless script.
The movie is more interesting than achieved: it's the most forthright statement of the transference theme in Hitchcock's work, but it's also the least nuanced.
While Hitchcock short-changes on the expected round of suspense for which he is noted, he does bring out a number of topflight performances and gives the picture an interesting polish that is documentary at times.