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James Richards is an ordinary middle-class man living a very comfortable and orderly life in London, working as a statistician. In this drama, he discovers that his safe and cozy world is rife with hidden corners and unimagined dangers. He first discovers that things are not as they seem when, through a client, he learns of a special film that has been suppressed by the British government. His search for that film leads him into the labyrinth of underground tunnels and offices which were built under the city during World War II, and he is pitted against an organized government conspiracy.