

The Burtons' maid, Partridge, receives a call from the Symmington's maidservant, Agnes, who seems distraught over something. The police begin to search for the anonymous letter writer. An inquest is held and the verdict of suicide is brought in. Her body is discovered with the letter, a glass containing potassium cyanide and a torn suicide note which reads "I can't go on". Things flare up when Mrs Symmington, the wife of the local solicitor, commits suicide upon receiving a letter stating that her second child was born out of wedlock. They quickly discover that these letters have been recently circulating around town, indiscriminate and completely inaccurate. They are just getting to know the town's strange cast of characters when an anonymous letter arrives, rudely accusing the two of being lovers, not siblings.

Jerry and Joanna Burton, brother and sister from London society, take a country house in idyllic Lymstock so that Jerry can rest from injuries received in a wartime plane crash.
