The anguish of a young wife who discovers that her husband is a Soviet spy becomes an occasion of torment for all of us before ["Conspirator"] runs its course….

As topical drama dealing with a situation that is especially meaningful at the moment, "Conspirator" is singularly devoid of conviction. In its … writing the film represents a standard exercise in romantic espionage. The deadly conventional attitude of the film is established right at the start when … a wide-eyed innocent from America meets a handsome British Army major at an elaborate military ball in London. At any rate the scenarists … do not deviate from pattern and the traitorous officer finally blows out his brains.

Although an attempt is made to explain why the popular and competent Major Curragh had embraced communism, his reasoning somehow failed to register on our attentive ears and so we know no more now than previously about what makes one turn traitor.