Calm in the canopy

A well-placed middle-aged man is at the airport witnessing a tiny incident of an unknown, perhaps Arab, young man with a servant. After the young man is confronted directly at the airport toilets, the man begins to be subject to an indefinable but greater sense of danger. The fear of the evil that circles around the man since then gradually becomes an obsession, an urgent desire to see the evil, finally, to catch it in the act and destroy it.