I agree with the writer of the previous comments. This is a little gem of a thriller, not because it has unusual plot twists, or even especially good acting, but because of its fantastic pacing (more like a modern thriller than the usual fare from 1951), and because of its fabulous shot-on-location scenes that put you right in post-war London. I grew up in post- war Britain, so perhaps I'm biased; but some of my favourite films are those which manage to escape the confines of the studio, something that was much rarer in those days than it is now. The world of the film is now more than half a century distant, and when you watch those streets, buses, and cars, those people walking around, it's slightly shocking to realize that many of them now sleep the big sleep, that you're looking through a window into the past. This alone, for me, is worth the price of admission.
The film is also the least talked about, most neglected of all Boulting's films, and as far as I can make out, hasn't ever been released on VHS, let alone on DVD, probably because, once the 1960s New Left had come into the ascendancy, especially in the various film studies institutes, the kind of old fashioned Cold War politics Boulting's film embodies were seen as both embarrassing and naive. Well, it's time for a re-evaluation. The politics of the film never did make much sense, so what we're left with is an exciting, well-crafted, and beautifully paced thriller, one that has, perhaps surprisingly, more heft than many contemporary thrillers, certainly more pizazz than the usual James Bond entries. If you can see it (and I discovered it courtesy of A&E, who ran it as a kind of joke several times in the early 1980s) sit back and enjoy it.
