Agatha has little time for the usual rural affairs with which she used to be so passionately involved in such as charity work, baking competitions and the Carsely Ladies Society. But in the quiet village of St Twadey on the outskirts of Mircester, tragedy strikes at the annual jam making competition. Someone has injected LSD into all the home-made jams and mayhem ensues. The judges go bananas on the spot and some of the more frail villagers who took the jams home end up either dead from heart attacks or from wandering under cars. Of course the youth of the village are the first to be suspected along with the few who have criminal records. But only blundering Agatha with her odd flashes of intuition would ever suspect the prim vicar's wife - but it will take all of her detective skills to prove the woman guilty!