It was the end of the day, and you were on the train, going home from work. The train was crowded, and people were almost crushing each other. The air conditioning fought a losing battle against the humidity, leaving condensation on the windows that blurred the passing city lights. You'd been staring at your reflection for the past five minutes when something - or someone - caught your eye. There, in the back corner of the carriage, stood an impossibly tall man wearing an old-fashioned leather mask. Unlike everyone else, he stood completely still, his posture unnaturally straight. As you watched, a chill ran down your spine as you became convinced his unseen gaze had locked onto you across the crowded space.