Which of these fictional sleuths is a spinster?

Jane Marple, usually referred to as Miss Marple, is a fictional character appearing in 12 of Agatha Christie's crime novels and in 20 short stories. Miss Marple is an elderly spinster who lives in the village of St. Mary Mead and acts as an amateur consulting detective. Alongside Hercule Poirot, she is one of the most loved and famous of Christie's characters and has been portrayed numerous times on screen. Her first appearance was in a short story published in The Royal Magazine in December 1927, "The Tuesday Night Club", which later became the first chapter of The Thirteen Problems (1932). Her first appearance in a full-length novel was in The Murder at the Vicarage in 1930.

The character of Miss Marple is based on Christie's step grandmother, or her aunt (Margaret West), and her cronies. Agatha Christie attributed the inspiration for the character of Miss Marple to a number of sources, stating that Miss Marple was "the sort of old lady who would have been rather like some of my step grandmother's Ealing cronies – old ladies whom I have met in so many villages where I have gone to stay as a girl".