The moving finger
(Book, Reserve)

A young man who has come to the small market town of Lymstock with his sister, Joanna, to recuperate from an accident. An outbreak of poison-pen letters in the village leads to two deaths, the first apparently suicide but the second definitely murder; the letters accuse various villagers of improbable and illicit sexual acts. The vicar's wife, Maud Dane Calthrop, invites her friend Miss Marple to stay at the vicarage, and she solves the puzzle alongside the local police and citizens.