Title: The Poisoned Pen - Agatha Christie - book
Summary :
The notary, the doctor, the pastor's wife... everyone is involved. And doubt creeps into people's minds. Where there's smoke, there's fire... Yet the accusations made by the anonymous letters flooding into Lymstock are utterly grotesque. Wouldn't it be more judicious to tackle the minor scandals that pepper village life? But no... The author of the letters prefers to indulge in fantasy...
However, by bombarding the small community with remarks as improbable as they are filthy, he will end up hitting the nail on the head one day. And who knows if he won't trigger a tragedy?