The Moving Finger (Miss Marple #4)

Lymstock is much like any other English village. Those that live there enjoy the peace of rural life until a series of poison pen letters destroy the safety they took for granted. When one villager commits suicide and another is murdered, the village is plunged into suspicion and terror. Once a village of trust, now all inhabitants are on the brink of accusations. Who could be writing the letters and why? Perhaps Miss Marple might be of help... (AgathaChristie.com)