A Spoonful of Poison by M.C. Beaton

Agatha Raisin is asked by the vicar of Comfrey Magna to help organize the village fete, since she has a background in public relations. The event looks to be on track for great success when Agatha books a well-known singer for the fest. The day turns tragic, however, when someone poisons the jams that are part of the jam tasting contest and two residents die. Agatha's detective agency is then hired to find out who was responsible. Agatha, along with her young associate Toni, delves into the lives of the residents of Comfrey Magna--especially handsome widower George Selby (who catches Agatha's eye) and the ladies who made the various jams. Will Agatha and her team again find the murderer before the police do? A Spoonful of Poison is a lighthearted look into English village life through the eyes of the sometimes abrasive yet lovable Agatha Raisin.