The Little Gray Man

Once upon a time a nun, a countryman, and a blacksmith lost their way in a forest. They wandered for a long time and finally they found an abandoned castle. They decided to live there, because they had no house. One day when a countryman and a blacksmith left the castle and went to the forest, so a nun stayed at the castle. Suddenly someone knocked at the front door... Who was it? Read the story to know!