First published in 1897, That Affair Next Door is another fascinating mystery by Anna Katharine Green. The story takes place in the late 1800's. A mature and single woman happens to see some visitors enter a house next door that has been empty as the family has been away for a while. When a woman is found dead in the home, she begins to think through the night she saw the strangers arrive and is called upon by the police for any information she may be able to provide. As a result of some of her questions she is able to accompany the police as they search the house for evidence...