There's a subgenre of Mystery Fiction called "Cozy Mysteries", a prevalent trope of which is the little old lady investigator. She is an older lady, usually retired, usually a Cool Old Lady, who has a knack for solving mysteries and who is always solving murders wherever she goes. She's usually an Amateur Sleuth, but occasionally she works for an agency or is a registered PI. The fact that people seem to keep dropping dead around her often makes her a Mystery Magnet. This sub-genre is also known as the "tea cozy mystery". Examples of Little Old Lady Investigates include: