The normally friendly village of Lymston is plagued by vile anonymous letters. When a mother of three takes her own life, following such a letter, Ms. Marple is not at all convinced things are as they seem.
While on vacation at a resort hotel in the West Indies, Miss Marple correctly suspects that the apparently natural death of a retired British major is actually the work of a murderer planning yet another killing.
A friend of Miss Marple's sees a woman being strangled in a passing train. When police cannot find a body and doubt the story, Miss Marple enlists professional housekeeper, Lucy Eyelesbarrow, to go undercover.
Her old friend Maude Calthrop, wife of the village vicar, summons Miss Marple when several of the local residents receive a poison pen letter. All of the recipients thus far are men and all are accused of some act of moral turpitude. When the local solicitor's wife, Angela Symington, is found dead with a poison pen letter at her side, the coroner rules that she took her own life. Not surprisingly, Jane Marple disagrees and is convinced it was murder. When a second villager is killed, it appears Miss Marple is correct. She also deduces the real purpose of the letters.Written by