You are a bookstore owner and you have multiple customers a day and not one of them know your blind because you know the layout of the store and can move around it with ease

You get the same customer every week and you can identify her by the sound of her heels but you are yet to know her name

You sit behind the counter and listen to music until you hear the door open and the little bell to tell you someone has entered

Then you hear the footsteps of heels on the hardwood floor