The episode is based on the Agatha Raisin book of the same name.
Mary Fortune, a seemingly perfect paragon of village life, is found murdered in her own back garden. As shockwaves reverberate through Carsely, a series of bizarre garden sabotages may hold the key to the mystery.
With James left heartbroken, Agatha investigates alone, finding no shortage of suspects in the tiny village of Carsely. At first, she believes the death of green-fingered Mary could be linked to the upcoming and hotly contested local gardening competition.
But as she digs deeper, she discovers that not only had Mary made a habit of rubbing the locals up the wrong way, but she was also hiding a tragic past, as well as a socialite daughter with a strong motive for murder.