One cold winter night, when the roads were slick and snow was falling outside, a man sat watching the fire he had built in his fireplace. The warm fire and the crackling wood had nearly lulled him in sleep when he heard a knock at the door. Three light taps. Tap, tap, tap and then it was silent. At first, he wasn’t sure if he had heard it, but in a few moments, it came again. Tap, tap, tap and then silence. The man rose from his chair and went to the door to see who might be there at that late hour. He opened the door and only the cold wind greeted him as no one was at the door. He peered into the darkeness, trying to see beyond the trees that were nearly outside the reach of the small bit of light that shown from the windows of the old house. He could see no one and he could not hear the sound of snow crunching under some visitor’s boots. He closed the door and returned to his chair. The man soon fell asleep, but he woke a few minutes later when he heard a knocking at the door. Tap,