Thrilling and quite a cliff-hanger!  Viewers don't see a real and physical threat to this man but it seems he was always on his toes.  There is overflowing paranoia and anxiety that one can't help but  begin  to feel paranoid, too.  The  images, sounds and over-all film scoring were all contributory to bring  about that feeling of suspense and  hair-raising thrill when there is an imminent sign of danger or repulsion.   Well-executed scenes and shots,  this is a must-watch!