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A well-placed middle-aged man is at the airport witnessing a tiny incident of an unknown, perhaps Arab, young man with a security attendant. After he is confronted directly at the airport toilets by the young man, the man begins to be subject to an indefinable but greater sense of danger. The fear of the evil that starts to gather him since that incident gradually turns into an obsession. He develops an urgent desire to see the evil, finally, to catch it and destroy it.