The Monthly Film Bulletin wrote: " Within its own limits, the story is quite competently handled, although the Iron Curtain trimmings begin to have a rather tired and jaded look. The Tower of London sequence is rather reminiscent of a Hitchcock film of the 1930's, but the present director's ability to sustain a mood does not equal that of her predecessor. The cast contains a wide variety of familiar English and un-English types, though some may feel that Margaret Leighton's wicked Helen is a little too much of a good thing."
The New York Times wrote, "an obvious fly-by-night, with a pretty good cast headed by the gifted Margaret Leighton and John Justin, this
Associated Artists release is a slow, contrived and exasperatingly arch puzzler that sets some sort of record for meandering banality". The
Radio Times called the film a "passable thriller" with "more than a hint of
The Third Man." In
British Sound Films: The Studio Years 1928–1959 David Quinlan rated the film as "good", writing: "Typical Durbridge mystery with fine profusion of 'cliffhanger' endings."
Leslie Halliwell said: "Peripatetic spy story with the twists expected of this author; all quite enjoyable." ==References==