describe the enounter between Mrs.Hall and the stranger when he opened the door at midday on whit monday

Mrs. Hall and the stranger begin to argue over the unpaid bill. This gets the whole place speculating that the stranger is responsible for the burglary. Finally the stranger gets fed up and reveals himself. 

You don't understand," he said, "who I am or what I am. I'll show you. By Heaven! I'll show you." Then he put his open palm over his face and withdrew it. The centre of his face became a black cavity. Ch 7