A spoonful of poison : an Agatha Raisin mystery
(Book)

The vicar of a nearby village persuades Agatha Raisin to help publicize a church fete. Agatha brings out the crowds for the fete, but there's more going on than innocent village fun. Several of the offerings in the jam-tasting booth turn out to be poisoned, and the festive family event becomes the scene of two murders. Along with her young and (much to her dismay) pretty sidekick, Toni, Agatha must uncover the truth behind the jam tampering, keep the church funds safe from theft, and expose the nasty secrets lurking in the village--all while falling for handsome George Selby, who may have secrets of his own.