I've encountered an annoying problem when I try to beat this game, which is that I can not get into Anna's flat. After I've moved the bell pull and door knocker for even a hundred times and tried to use the ring of keys on door, Waston always said that there might be some one in the room and wouldn't let me in. I don't know why. I learned from the conversation with Anna's boyfriend that the housekeeper is nearly deaf, and I tried to move the door bell long. But I spent nearly ten minutes without any progress. Does anyone know how to solve this problem? Should I repeat ringing? I would be very grateful for your answers!