Pushing Up Daisies by M.C. Beaton

When Lord Bellington is poisoned to death, his son, Damian, hires Agatha Raisin's detective agency to find his killer. Bellington made many enemies when he decided to possibly sell some of his land to a developer. The land is used for allotments for the villagers in the small village of Carsely to grow fruits and vegetables. When there is yet another murder, Agatha wonders if the crimes are connected, or if there are two separate cases to solve. Despite the police wanting Agatha to stop her investigating, she can be tenacious in her quest for justice to be served. Pushing Up Daisies will be published in September.