Wentworth, Patricia. Miss Silver Mysteries #bk. 29

A series of cruel letters upends life in a small village, and Miss Silver searches for the anonymous scribe It is through her friend Frank Abbott, of Scotland Yard, that Miss Silver first learns of the anonymous letters. A widowed cousin of his, living in a small country village, is being tortured by an unknown author who insinuates that the young woman's husband may not have died of natural causes. It is a case of the kind of cruelty that is all too common in the countryside, and the governess-turned-detective listens with only polite interest. Then the first death comes. Another target of the letter-writing campaign, tortured by the threats to reveal her darkest secrets, drowns herself in the manor-house pond. The Yard sends Abbott to unmask the sinister letter-writer, and he brings Miss Silver along as an undercover agent, masquerading as a tourist as she attempts to stop the next death before it happens

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