It's better to read books on this subject...the extra DVD textual material about the life of the real Gouzenko was the best part. I found myself skipping through some talky parts about 40 minutes into it. It has a docudrama style of direction which gets tiresome. The actors playing the Soviets are a bit stiff, but Harry Townes as the defector Igor Gouzenko is good.
Definitely something you have to be in the right mood for. If you like spy stuff, be warned this is no James Bond adventure but rather an apparently fact-based account of an international incident. It's set ten years after Gouzenko's defection to Canada with top-secret Soviet documents in hand.
Good for its type but I can see how it would quickly disinterest a large percentage of viewers.