Agatha Raisin - Season 4 Episode 1 -

During the dark, grey days of early December, the sleuth is obsessed by two things - the looming festivities, and her ex James Lacey. In order to drive the latter from her thoughts, Agatha concentrates on planning the perfect Christmas for her friends, but when there's a poisoning in the village, it's down to her to solve the case before the 25th rolls around.